Perhaps you should try some spelling variations:
triet tinh » trieu tinh, trien kinh, tri tinh
trien tinh » trieu tinh, trien kinh, trien minh
nhung cong » dung cong, thong cong, hang cong
trang va » hang va
tran van » luan van
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than tap » toan tap, han tap, phan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: mon ((triet tinh) or (trien tinh)) - hanh ((trang va) or (tran van)) nhung cong dan than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: mon ((triet tinh) OR (trien tinh)) - hanh ((trang va) OR (tran van)) nhung cong dan than tap.
• Adding a wildcard symbol may retrieve word variants: mon ((triet tinh) or (trien tinh)) - hanh ((trang va) or (tran van)) nhung cong dan than tap*.