Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
doi chieu » doc hieu, doi chi, ho chieu
hoc thieu » toc thieu, hoc hien
hanh tang » hanh trang, anh tang, hanh mang
dung cong » dung trong
manh toan » thanh toan, anh tuan, tinh toan
toan ban » van ban
tang va » trang va, tang van, thang va

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

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