Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
thieu sang » chieu sang, thieu khang, hieu lang
canh doanh » hanh doanh, chinh doanh, doanh doanh
cua trong » cua truong, cua trung, ca trong
qua trong » quan trong, qua trinh, qua song
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 ((thieu sang) or (thieu quang)) - canh doanh ((cua trong) OR (qua trong)) cong dan ca cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (thieu quang)) - canh doanh ((cua trong) OR (qua trong)) cong dan ca cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) or (thieu quang)) - canh doanh ((cua trong) OR (qua trong)) cong dan ca cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (thieu quang)) - canh doanh ((cua trong) OR (qua trong)) cong dan ca cau*.