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
nang mai » nang ma, nang tai, lang mai
va hanh » van hanh, va thanh, va danh
cam luc » cau luc
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
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: su ((sach thu) OR (sach thue)) nang mai hoi. hieu ve ((cam luc) or (cam xuc)) va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach thu) OR (sach thue)) nang mai hoi. hieu ve ((cam luc) OR (cam xuc)) va hanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach thu) OR (sach thue)) nang mai hoi. hieu ve ((cam luc) or (cam xuc)) va hanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach thu) OR (sach thue)) nang mai hoi. hieu ve ((cam luc) or (cam xuc)) va hanh dai cua tre*.