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
giao cua » gian cua, gia cua, giau cua
tu sach » thu sach, su sach, te sach
vien da » vien dai, hien dai
y nang » ky nang, ly nang, v nang
dan va » doan va, dan ca, han 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 da ((dan va) OR (ban 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 da ((dan va) OR (ban 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 x hoi. hieu vien da ((dan va) OR (ban va)) hinh giao cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat sach)) y nang x hoi. hieu vien da ((dan va) OR (ban va)) hinh giao cua triet*.