Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
thieu sang » chieu sang, thieu khang, hieu lang
canh trinh » canh tranh, hanh trinh, canh tinh
dong huong » dong thuong, dong duong, cong huong
trinh qua » trinh quan, trinh cua, trinh quang
qua dong » quan dong, qua duong, qua song
phan cau » phan cac, phan tu, phan lap
phan dau » phan tu, hang dau

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