Perhaps you should try some spelling variations:
sach thue » sach thieu, sach tham, cach thuc
sach thu » sach thieu, sach tham, cach thuc
hanh dai » hanh tai, hanh dao, vanh dai
thuc va » thuc vat, thuc dan, thuc day
thi van » thi lan, thi hanh, thi nang
van cam » van nam, van lam, van cau
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet

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 thu) or (sach thue)) lang xa hoi. thi van cam ((duc va) or (thuc va)) hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thu) OR (sach thue)) lang xa hoi. thi van cam ((duc va) OR (thuc va)) hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach thu) or (sach thue)) lang xa hoi. thi van cam ((duc va) or (thuc va)) hanh dai cua tre*.