Perhaps you should try some spelling variations:
thanh tung » thanh cong
nang cong » bang cong, hang cong, nang dong
dang cong » dung cong
theo chu » theo chieu, cho chu, chao chu
chu sach » cau sach, thu sach, chieu sach
van than » van thanh, van thang, van tuan
than cau » toan cau, phan cau, than cap
tung va » trung va, tuong va, dung va

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 - thanh tung va ((((nang cong) OR (nang song))) or (dang cong)) van than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chu sach - thanh tung va ((((nang cong) OR (nang song))) OR (dang cong)) van than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chu sach - thanh tung va ((((nang cong) OR (nang song))) or (dang cong)) van than cau".
• Adding a wildcard symbol may retrieve word variants: theo chu sach - thanh tung va ((((nang cong) OR (nang song))) or (dang cong)) van than cau*.