Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
thuc dan » thuc hanh, hoc dan, thuc vat
dinh dai » dinh dat, sinh dai, dinh dao
su sach » so sach, vu sach
tang ma » mang may, tang van
hieu ve » hieu va, hieu van
y tang » ky tang, 6 tang, 7 tang
ma hoi » mai hoi, xa hoi, ma hoa
ve nam » he nam, va nam, le nam
cua te » cua tu

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 y tang ma hoi. hieu ve nam thuc dan ((dinh dai) or (dinh ket)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y tang ma hoi. hieu ve nam thuc dan ((dinh dai) OR (dinh ket)) cua te.
• Adding a wildcard symbol may retrieve word variants: su sach y tang ma hoi. hieu ve nam thuc dan ((dinh dai) or (dinh ket)) cua te*.