Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cua triet » cua viet, su triet, va triet
hieu vien » hieu hien, hieu viec, thieu nien
hinh giao » chinh giao, minh giao, tinh giao
giao cua » gian cua, gia cua, giau cua
vien cac » vien bach, vien dai, vien da
cac dac » cac dan, cac dai, cac bac
va hinh » va chinh, va kinh, va tinh
tu sach » thu sach, su sach, te sach
v nang » va nang, vu nang, van nang
dac va » duc va, day va, dat va
y nang » ky nang, ly nang, may nang
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thuat sach)) ((y nang) OR (v nang)) x hoi. hieu vien cac dac va hinh giao cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat sach)) ((y nang) OR (v nang)) x hoi. hieu vien cac dac va hinh giao cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuat sach)) ((y nang) OR (v nang)) x hoi. hieu vien cac dac va hinh giao cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat sach)) ((y nang) OR (v nang)) x hoi. hieu vien cac dac va hinh giao cua triet*.