Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
nang doc » nang luc
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, va danh
chu duc » thu duc, chua duoc, cuu duoc
te sach » toc sach
nang ho » nang hoc, nang co, tang ho
hieu ve » hieu va, hieu van
ve chu » ve cau, va chu, ve che

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 y ((nang ho) or (nang doc)) hoi. hieu ve chu duc va hanh kem ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((nang ho) OR (nang doc)) hoi. hieu ve chu duc va hanh kem ((cua tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: te sach y ((nang ho) or (nang doc)) hoi. hieu ve chu duc va hanh kem ((cua tre) or (cau tren))*.