Perhaps you should try some spelling variations:
nang dau » hang dau, xang dau, nang du
dan nang » da nang, van nang, dai nang
thuc dan » thuc hanh, hoc dan, thuc vat
nang dai » nang tai, lang dai, nang cai
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
luc cua » luc chua, luc nua, tuc cua
te sach » toc sach
vu sach » vu bach, su sach, vu khach
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: ((te sach) or (vu sach)) ky ((nang dai) OR (nang dau)) hoi. hieu van nam thuc dan nang luc cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (vu sach)) ky ((nang dai) OR (nang dau)) hoi. hieu van nam thuc dan nang luc cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (vu sach)) ky ((nang dai) OR (nang dau)) hoi. hieu van nam thuc dan nang luc cua tu".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (vu sach)) ky ((nang dai) OR (nang dau)) hoi. hieu van nam thuc dan nang luc cua tu*.