Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
trinh vat » trinh van, trinh luat, sinh vat
trinh va » trinh van, trinh ve, trinh vi
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan ban » van ban
ho chau » ha chau, o chau, khoa chau
ho chu » hoi chu, cho chu, ho chua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chau) OR (ho chu)) tinh - hanh ((trinh va) OR (trinh vat)) nhung cong dan toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chau) or (ho chu)) tinh - hanh ((trinh va) OR (trinh vat)) nhung cong dan toan ban~".
• Adding a wildcard symbol may retrieve word variants: ((ho chau) or (ho chu)) tinh - hanh ((trinh va) OR (trinh vat)) nhung cong dan toan ban*.