Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
theo chu » theo chieu, cho chu, chao chu
chu sach » cau sach, thu sach, chieu sach
trang va » hang va
tran van » luan van
cong san » cong tac
than cau » toan cau, phan cau, than cap
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: theo chu sach - hanh ((trang va) OR (tran van)) nhung cong san ((than cau) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chu sach - hanh ((trang va) OR (tran van)) nhung cong san ((than cau) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chu sach - hanh ((trang va) OR (tran van)) nhung cong san ((than cau) or (toan ban))".
• Adding a wildcard symbol may retrieve word variants: theo chu sach - hanh ((trang va) OR (tran van)) nhung cong san ((than cau) or (toan ban))*.