Perhaps you should try some spelling variations:
dan thanh » dang thanh, danh thanh, ban thanh
hieu van » hieu va, thien van, lieu va
thanh de » hanh de, thanh ve, thanh do
thuc dan » thuc hanh, hoc dan, thuc vat
nam thuc » nam thuoc, am thuc, nam thu
sach thu » sach thue, sach thieu, sach tham
vu sach » vu bach, su sach, vu khach
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach thu ((nang xa) OR (nang ma)) hoi. hieu van nam thuc dan thanh de ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach thu ((nang xa) OR (nang ma)) hoi. hieu van nam thuc dan thanh de ((cua te) OR (cua tu))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach thu ((nang xa) OR (nang ma)) hoi. hieu van nam thuc dan thanh de ((cua te) or (cua tu))*".