Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
trinh cua » tinh cua, trinh luat, trinh luan
bang cong » dang cong, bang song, hang cong
doc hieu » toc thieu, hoc thieu, hoc hien
cong van » cong vang, cong san, song van
van tay » van tai, van tan, van tam
tay cao » tao cao, tay co, toan cao

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 (theo tieu)) xanh - hanh ((trinh cua) OR (trinh quan)) bang cong van tay cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (theo tieu)) xanh - hanh ((trinh cua) OR (trinh quan)) bang cong van tay cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) or (theo tieu)) xanh - hanh ((trinh cua) OR (trinh quan)) bang cong van tay cao".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (theo tieu)) xanh - hanh ((trinh cua) OR (trinh quan)) bang cong van tay cao*.