Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
tang luan » dung luan
doc hieu » toc thieu, hoc thieu, hoc hien
tang cua » mang cua, hang cua, thong cua
cong van » cong vang, cong san, song van
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan tap
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: ((doc hieu) or (doi chi)) xanh - hanh ((tang cua) OR (tang luan)) nhung cong van toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (doi chi)) xanh - hanh ((tang cua) OR (tang luan)) nhung cong van toan cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) or (doi chi)) xanh - hanh ((tang cua) OR (tang luan)) nhung cong van toan cao*".