Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
hanh trong » hanh trang, anh trong, hinh trong
trong quan » thong quan, tong quan, thong quang
hien sang » hien trang, khien bang, thien bang
quan dung » quang dung, quan duong, qua dung
cong tap » cuong tap, cong tac, tong tap
cong tan » cong tac, cong san, cong thanh
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: hoc ((hien sang) or (chieu sang)) - hanh trong quan dung ((cong tap) OR (cong tan)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sang) OR (chieu sang)) - hanh trong quan dung ((cong tap) OR (cong tan)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien sang) or (chieu sang)) - hanh trong quan dung ((cong tap) OR (cong tan)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sang) or (chieu sang)) - hanh trong quan dung ((cong tap) OR (cong tan)) toan cao*.