Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
thong cong » trong cong, tong cong, thong thong
tran tuan » tran thanh, tranh luan, tran van
tran xuan » tran van
doc hieu » toc thieu, hoc thieu, hoc hien
cong san » cong tac
san tuan » van tuan, san luan, san quan
tuan ban » tuan bang, toan ban, luan ban

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 - hanh ((((tran tuan) OR (tran quang))) or (tran xuan)) thong cong san tuan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu nganh - hanh ((((tran tuan) OR (tran quang))) OR (tran xuan)) thong cong san tuan ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu nganh - hanh ((((tran tuan) OR (tran quang))) or (tran xuan)) thong cong san tuan ban*".