Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
danh lai » gianh lai, dinh lam, hanh lam
danh sai » dung sai, danh bat, danh dau
chau tre » chay tren, chau tho, cho tre
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
xuc va » tuc va, luc va, xac va

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 ky nang cao hoi. hieu van cham ((xuc va) or (duc va)) ((danh lai) OR (danh sai)) chau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang cao hoi. hieu van cham ((xuc va) OR (duc va)) ((danh lai) OR (danh sai)) chau tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang cao hoi. hieu van cham ((xuc va) or (duc va)) ((danh lai) OR (danh sai)) chau tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang cao hoi. hieu van cham ((xuc va) or (duc va)) ((danh lai) OR (danh sai)) chau tre*.