Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hoc chiet » hoc thiet, hoc hien, hoc viet
hoc nhiet » hoc thiet, hoc nghien, hoc hien
trang va » hang va
tran van » luan van
cong dan » cong san, cong tan, huong dan
dan van » dang van, doan van, dao van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc chiet) or (hoc nhiet)) tach - hanh ((trang va) OR (tran van)) nhung cong dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chiet) OR (hoc nhiet)) tach - hanh ((trang va) OR (tran van)) nhung cong dan van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chiet) or (hoc nhiet)) tach - hanh ((trang va) OR (tran van)) nhung cong dan van ban".
• Adding a wildcard symbol may retrieve word variants: ((hoc chiet) or (hoc nhiet)) tach - hanh ((trang va) OR (tran van)) nhung cong dan van ban*.