Perhaps you should try some spelling variations:
trinh toan » tinh toan, thanh toan, trinh han
thanh hoa » thanh pho
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 hoa)) 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 hoa)) dung ((cong dan) OR (cong tan)) thanh bac.
• Adding a wildcard symbol may retrieve word variants: doi chi xanh - hanh ((trinh toan) or (thanh hoa)) dung ((cong dan) or (cong tan)) thanh bac*.