Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
ho chieu » theo chieu, hoc thieu, doi chieu
trang va » tran van
cong tac » cong ty
than man » thanh san, tran manh, than phan
than ma » than va, khan ma, nhan ma

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 chieu sach - hanh ((trang va) OR (hang va)) nhung cong tac ((than man) OR (than ma))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - hanh ((trang va) or (hang va)) nhung cong tac ((than man) OR (than ma))~".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - hanh ((trang va) or (hang va)) nhung cong tac ((than man) OR (than ma))*.