Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
trinh cua » tinh cua, trinh luat, trinh luan
dong cong » duong cong, dung cong, dang cong
doc hieu » toc thieu, hoc thieu, hoc hien
cong van » cong vang, cong san, song van
van va » van vat, van van, ban va
va ban » van ban, va bai, va bao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo tieu) or (doc hieu)) xanh - hanh ((trinh cua) or (trinh quan)) dong cong van va ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo tieu) OR (doc hieu)) xanh - hanh ((trinh cua) OR (trinh quan)) dong cong van va ban.
• Adding a wildcard symbol may retrieve word variants: ((theo tieu) or (doc hieu)) xanh - hanh ((trinh cua) or (trinh quan)) dong cong van va ban*.