Perhaps you should try some spelling variations:
thanh dung » thanh duong, thanh tung, thanh hung
nhung cong » thong cong, hang cong, nhung don
viet tach » viet sach, viet thanh, chiet tach
viet tech » viet sach
dung cong » dung trong
dan thai » dang thai, dan thi, dan than
thai cao » tai cao, thoai cac, thuat cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: khoa ((viet tach) OR (viet tech)) - thanh dung luan ((nhung cong) or (dung cong)) dan thai cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: khoa ((viet tach) OR (viet tech)) - thanh dung luan ((nhung cong) OR (dung cong)) dan thai cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "khoa ((viet tach) OR (viet tech)) - thanh dung luan ((nhung cong) or (dung cong)) dan thai cao".
• Adding a wildcard symbol may retrieve word variants: khoa ((viet tach) OR (viet tech)) - thanh dung luan ((nhung cong) or (dung cong)) dan thai cao*.