Perhaps you should try some spelling variations:
va triet » va trien, ve triet, cua triet
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
nam thuc » nam thuoc, am thuc, nam thu
hanh va » hang va, hanh vi
hieu ve » hieu va, hieu van
sach ly » sach y, sach lo, sach hay
nang ma » tang ma, sang ma, nang cao
sach ty » sach y, sach tu, sach thu
ve nam » he nam, va nam, le nam
ma hoi » mai hoi, xa hoi, ma hoa
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: su ((sach ly) or (sach ty)) nang ma hoi. hieu ve nam thuc van hanh va ((va triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ly) OR (sach ty)) nang ma hoi. hieu ve nam thuc van hanh va ((va triet) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: su ((sach ly) or (sach ty)) nang ma hoi. hieu ve nam thuc van hanh va ((va triet) or (va thiet))*.