Perhaps you should try some spelling variations:
va triet » va trien, ve triet, cua triet
hanh vai » hanh vi, hanh va, hanh tai
so sach » so sanh, bo sach, co sach
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
ve am » va am
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y ((nang ma) or (tang ma)) hoi. hieu ve am thuc va hanh vai ((va triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ((nang ma) OR (tang ma)) hoi. hieu ve am thuc va hanh vai ((va triet) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: so sach y ((nang ma) or (tang ma)) hoi. hieu ve am thuc va hanh vai ((va triet) or (va thiet))*.