Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, sach tham
thue nang » thien nang, thuat nang, thi nang
van cham » van chat, van tham, va cham
hanh dai » hanh tai, hanh dao, vanh dai
hieu van » hieu va, thien van, lieu va
te sach » toc sach
cao hoi » cau hoi, cao hoc, tao hoi
cua tre » cua te, cuu tre, cua triet
co hoi » co hoc, co loi
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach thue nang ((cao hoi) OR (co hoi)). hieu van cham ((xuc va) or (tuc va)) hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thue nang ((cao hoi) OR (co hoi)). hieu van cham ((xuc va) OR (tuc va)) hanh dai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thue nang ((cao hoi) OR (co hoi)). hieu van cham ((xuc va) or (tuc va)) hanh dai cua tre*".