Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
chieu sang » chieu sach, chieu xanh, hieu lang
canh doanh » hanh doanh, chinh doanh, doanh doanh
cua trong » cua truong, qua trong, ca trong
cua trung » cua truong, xuan trung, cua nhung
cong dan » cong san, cong tan, huong dan
ca cau » cua cau, cac cau, can cau

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 (thieu quang)) - canh doanh ((cua trong) OR (cua trung)) cong dan ca cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (thieu quang)) - canh doanh ((cua trong) OR (cua trung)) cong dan ca cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) or (thieu quang)) - canh doanh ((cua trong) OR (cua trung)) cong dan ca cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (thieu quang)) - canh doanh ((cua trong) OR (cua trung)) cong dan ca cau*.