Perhaps you should try some spelling variations:
dung cong » dung trong
theo hoc » theo hop, te hoc, cho hoc
thao hoc » thai hoc, than hoc, thao khoa
anh tang » anh bang, anh nang, anh sang
anh dang » anh dong, anh dung, anh bang
cua dung » cua dang, cua dong, qua dung
cong tan » cong tac, cong san, cong thanh
tran cao » toan cao, tran chau, trang cho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo hoc) or (thao hoc)) sach - ((anh tang) OR (anh dang)) cua dung cong tan tran cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo hoc) OR (thao hoc)) sach - ((anh tang) OR (anh dang)) cua dung cong tan tran cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo hoc) or (thao hoc)) sach - ((anh tang) OR (anh dang)) cua dung cong tan tran cao".
• Adding a wildcard symbol may retrieve word variants: ((theo hoc) or (thao hoc)) sach - ((anh tang) OR (anh dang)) cua dung cong tan tran cao*.