Perhaps you should try some spelling variations:
thien danh » thien anh, thien thanh, thien chanh
thien dang » thien bang, thien nang, thien cong
dung cong » dung trong
trang va » hang va
tran van » luan van
cong tan » cong tac, cong san, cong thanh
van chat » cao chat
tan van » tang van, luan van, dang 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 ((thien danh) OR (thien dang)) - hanh ((trang va) or (tran van)) dung cong tan van chat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien danh) OR (thien dang)) - hanh ((trang va) OR (tran van)) dung cong tan van chat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien danh) OR (thien dang)) - hanh ((trang va) or (tran van)) dung cong tan van chat".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien danh) OR (thien dang)) - hanh ((trang va) or (tran van)) dung cong tan van chat*.