Perhaps you should try some spelling variations:
nhanh tinh » nhanh thanh, hanh trinh, nhan sinh
luan tuong » luat thuong, xuan truong, luan phuong
luan luong » luan phuong, tuan duong, van luong
hieu lang » chieu sang, hieu quang, nhieu tang
doi hieu » doi chieu, doc hieu, doi hien
cong van » cong vang, cong san, song van
van toan » van tuan, van tan, van thanh
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi hieu lang - ((tinh toan) or (nhanh tinh)) ((luan tuong) OR (luan luong)) cong van toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - ((tinh toan) OR (nhanh tinh)) ((luan tuong) OR (luan luong)) cong van toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi hieu lang - ((tinh toan) or (nhanh tinh)) ((luan tuong) OR (luan luong)) cong van toan tap".
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - ((tinh toan) or (nhanh tinh)) ((luan tuong) OR (luan luong)) cong van toan tap*.