Perhaps you should try some spelling variations:
trinh toan » tinh toan, trinh han, trinh quan
thanh toan » thanh hoa, thanh san, tinh toan
thanh bac » nhanh bac, thanh bai, thanh san
chi xanh » chi anh, chi danh, chi hanh
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chi xanh - hanh ((trinh toan) or (thanh toan)) dung ((cong dan) OR (cong tan)) thanh bac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi xanh - hanh ((trinh toan) OR (thanh toan)) dung ((cong dan) OR (cong tan)) thanh bac.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chi xanh - hanh ((trinh toan) or (thanh toan)) dung ((cong dan) OR (cong tan)) thanh bac".
• Adding a wildcard symbol may retrieve word variants: doi chi xanh - hanh ((trinh toan) or (thanh toan)) dung ((cong dan) OR (cong tan)) thanh bac*.