Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
chieu xanh » chieu sach, chieu sang, chieu tinh
cong thuat » trong thuat, vuong thuat, cong thuc
thuat hang » thuat hung, thuat bang, thuat mang
hang cong » dang cong, hang nong, bang cong
cong tan » cong tac, cong san, cong thanh
tan van » tran van, tang van, luan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu nganh) or (chieu xanh)) - thanh cong thuat hang cong tan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu nganh) OR (chieu xanh)) - thanh cong thuat hang cong tan van ban*.