Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
trinh cua » trinh luat, trinh quan, trinh luan
doc hieu » toc thieu, hoc thieu
tinh cua » sinh cua, tinh chat, tranh cua
cong van » cong vang, cong san, song van
van toan » van tuan, van tan, van thanh
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc hien) or (doc hieu)) xanh - hanh ((trinh cua) OR (tinh cua)) nhung cong van toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc hien) OR (doc hieu)) xanh - hanh ((trinh cua) OR (tinh cua)) nhung cong van toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc hien) or (doc hieu)) xanh - hanh ((trinh cua) OR (tinh cua)) nhung cong van toan ban".
• Adding a wildcard symbol may retrieve word variants: ((hoc hien) or (doc hieu)) xanh - hanh ((trinh cua) OR (tinh cua)) nhung cong van toan ban*.