Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, nhung don
hoc thieu » toc thieu, hoc hien
hang cong » dang cong, hang nong, bang cong
ho chieu » theo chieu, doi chieu, mot chieu
canh anh » anh anh, canh tranh, thanh anh
toan cao » toan ban, toan tap
anh va » hanh va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (hoc thieu)) xanh - canh anh va ((nhung cong) OR (hang cong)) tinh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc thieu)) xanh - canh anh va ((nhung cong) OR (hang cong)) tinh toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (hoc thieu)) xanh - canh anh va ((nhung cong) OR (hang cong)) tinh toan cao".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (hoc thieu)) xanh - canh anh va ((nhung cong) OR (hang cong)) tinh toan cao*.