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