Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
nhung cong » dung cong, hang cong, nhung don
hieu sang » chieu sang, hieu lang, hieu quang
manh hung » anh huong
manh tung » thanh tung
hach toan » thanh toan, manh toan
doc hieu » toc thieu, hoc thieu, hoc hien
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu sang - ((manh hung) or (manh tung)) cua ((nhung cong) OR (thong cong)) hach toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sang - ((manh hung) OR (manh tung)) cua ((nhung cong) OR (thong cong)) hach toan ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu sang - ((manh hung) or (manh tung)) cua ((nhung cong) OR (thong cong)) hach toan ban*".