Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu xanh » chieu xanh, hieu manh, hieu nganh
san chang » ban hang, van khang, san chay
doc hieu » toc thieu, hoc thieu, hoc hien
dan chan » dan gian, dan ca, van chat
manh va » anh va, minh va, lanh va
hanh va » hang va, hanh vi

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 xanh - canh ((manh va) or (hanh va)) nhung cong ((san chang) OR (dan chan)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - canh ((manh va) OR (hanh va)) nhung cong ((san chang) OR (dan chan)) tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - canh ((manh va) or (hanh va)) nhung cong ((san chang) OR (dan chan)) tu".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - canh ((manh va) or (hanh va)) nhung cong ((san chang) OR (dan chan)) tu*.