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 dang, anh nang
tang cua » mang cua, hang cua, tang luan
cua dung » cua dang, cua dong, qua dung
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cao » toan ban, toan tap

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 cua dung cong tan toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo hoc) OR (thao hoc)) sach - anh tang cua dung cong tan toan cao".
• Adding a wildcard symbol may retrieve word variants: ((theo hoc) OR (thao hoc)) sach - anh tang cua dung cong tan toan cao*.