Perhaps you should try some spelling variations:
dang thuong » hang thuong, dung thuong, dong thuong
truong cong » trong cong, truong dong, truong long
mang thong » mang trong, hang thuong, nang thuong
tranh cac » trinh cac, thanh cac, tranh cai
doc hieu » toc thieu, hoc thieu, hoc hien
ho chieu » theo chieu, hoc thieu, doi chieu

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) or (ho chieu)) xanh - canh tranh cac truong cong ((mang thong) OR (dang thuong)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (ho chieu)) xanh - canh tranh cac truong cong ((mang thong) OR (dang thuong)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) or (ho chieu)) xanh - canh tranh cac truong cong ((mang thong) OR (dang thuong)) cau".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (ho chieu)) xanh - canh tranh cac truong cong ((mang thong) OR (dang thuong)) cau*.