Perhaps you should try some spelling variations:
quang dung » quang trung, ung dung, cuong dung
theo chu » theo chieu, cho chu, chao chu
chu sach » cau sach, thu sach, chieu sach
anh tang » anh bang, anh dang, anh nang
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
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 chu sach - ((anh tang) or (nhanh quang)) quang dung ((cong tan) OR (cong san)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chu sach - ((anh tang) OR (nhanh quang)) quang dung ((cong tan) OR (cong san)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chu sach - ((anh tang) or (nhanh quang)) quang dung ((cong tan) OR (cong san)) toan cao".
• Adding a wildcard symbol may retrieve word variants: theo chu sach - ((anh tang) or (nhanh quang)) quang dung ((cong tan) OR (cong san)) toan cao*.