Perhaps you should try some spelling variations:
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
sinh trong » sinh truong, sinh trung, dinh trong
dieu luong » dieu duong, dieu tuong, tien luong
luong cong » dung cong, trong cong, cong cong
khoan cam » khoa cam, khoan va, phan cam
cong tan » cong tac, cong san, cong thanh
khan cap » khan ap, than cap, phan cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sang) or (chieu sach)) - sinh trong dieu luong cong tan ((khan cap) OR (khoan cam))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (chieu sach)) - sinh trong dieu luong cong tan ((khan cap) OR (khoan cam)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) or (chieu sach)) - sinh trong dieu luong cong tan ((khan cap) OR (khoan cam))".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (chieu sach)) - sinh trong dieu luong cong tan ((khan cap) OR (khoan cam))*.