Perhaps you should try some spelling variations:
trinh cong » trinh dung
hieu manh » chieu xanh, hieu nganh, dieu hanh
thien anh » thien danh, tien anh, thien thanh
tranh qua » tranh cua, thanh qua, tranh quang
trinh qua » trinh quan, trinh cua, trinh quang
cong dan » cong san, cong tan, huong dan
ca cac » cua cac, va cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu manh) or (thien anh)) - canh ((tranh qua) OR (trinh qua)) trinh cong dan ca cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (thien anh)) - canh ((tranh qua) OR (trinh qua)) trinh cong dan ca cac.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) or (thien anh)) - canh ((tranh qua) OR (trinh qua)) trinh cong dan ca cac".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (thien anh)) - canh ((tranh qua) OR (trinh qua)) trinh cong dan ca cac*.