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