Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
thanh qua » thanh quan, thanh qui, thanh xuan
dung cong » dung trong
thanh lap » thanh san, phan lap, thanh hai
doc hieu » toc thieu, hoc thieu, hoc hien
hanh qua » hanh sua, hanh cua, danh qua
cong tan » cong tac, cong san, cong thanh
phan dau » phan tu, hang dau

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 ((thanh qua) OR (hanh qua)) dung cong tan ((thanh lap) or (phan dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - canh ((thanh qua) OR (hanh qua)) dung cong tan ((thanh lap) OR (phan dau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - canh ((thanh qua) OR (hanh qua)) dung cong tan ((thanh lap) or (phan dau))".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - canh ((thanh qua) OR (hanh qua)) dung cong tan ((thanh lap) or (phan dau))*.