Perhaps you should try some spelling variations:
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
tuan chung » luan chung, toan chung, tuan hung
cuong danh » cuon danh, cuong linh, cong dan
manh hung » anh huong
hung tuan » hung tran, quang tuan, trung tuan
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 ((chieu sang) or (chieu sach)) - manh hung tuan chung ((cuong danh) OR (huong dan)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (chieu sach)) - manh hung tuan chung ((cuong danh) OR (huong dan)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) or (chieu sach)) - manh hung tuan chung ((cuong danh) OR (huong dan)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (chieu sach)) - manh hung tuan chung ((cuong danh) OR (huong dan)) toan cao*.