Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh luan » khanh luan, hang luan, hanh luat
van nhung » van nhuong, va nhung, van hung
tay tieng » day tieng, toan tieng, tu tieng
tap tieng » phap tieng, tu tieng, va tieng
ta tieng » tu tieng, va tieng, ban tieng
ho diep » hong diep, cho dieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho diep tinh - hanh luan van nhung cong ((((tay tieng) OR (tap tieng))) or (ta tieng)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho diep tinh - hanh luan van nhung cong ((((tay tieng) OR (tap tieng))) OR (ta tieng)) tap*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho diep tinh - hanh luan van nhung cong ((((tay tieng) OR (tap tieng))) or (ta tieng)) tap*".