Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat
nhung cong » dung cong, thong cong, hang cong
hieu xanh » chieu xanh, hieu manh, hieu nganh
doc hieu » toc thieu, hoc thieu, hoc hien
cong van » cong vang, cong san, song van
van toan » van tuan, van tan, van thanh
toan cau » toan cao, toan ban, toan tap

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 xanh - hanh ((trinh quan) or (trinh han)) nhung cong van toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - hanh ((trinh quan) OR (trinh han)) nhung cong van toan cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh ((trinh quan) or (trinh han)) nhung cong van toan cau*.