Perhaps you should try some spelling variations:
thanh tung » thanh cong
cong quang » luong quang, thong quang, duong quang
theo cau » theo chu, theo cap, theo dau
cau sach » cao sach, hau sach, rau sach
cong van » cong vang, cong san, song van
tung va » trung va, tuong va, dung va
va hang » van hang, va nang, va lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo cau sach - thanh tung va hang ((cong van) or (cong quang)) van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo cau sach - thanh tung va hang ((cong van) OR (cong quang)) van ban.
• Adding a wildcard symbol may retrieve word variants: theo cau sach - thanh tung va hang ((cong van) or (cong quang)) van ban*.