Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
thuc dan » thuc hanh, hoc dan, thuc vat
thanh ve » hanh ve, thanh va, thanh vien
thanh de » hanh de, thanh do, thanh le
hieu van » hieu va, thien van, lieu va
sach ty » sach tu, sach thu, xach tay
nang xa » nang x, lang xa, nang ma
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 ty) OR (sach y)) nang xa hoi. hieu van nam thuc dan ((thanh de) or (thanh ve)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach y)) nang xa hoi. hieu van nam thuc dan ((thanh de) OR (thanh ve)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) OR (sach y)) nang xa hoi. hieu van nam thuc dan ((thanh de) or (thanh ve)) cua te".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) OR (sach y)) nang xa hoi. hieu van nam thuc dan ((thanh de) or (thanh ve)) cua te*.