Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
nhung huong » nhung phuong, nhung tuong, nhung cong
thieu sang » chieu sang, thieu khang, hieu lang
trinh quan » tinh quang, trinh luat, trinh han
trinh cua » tinh cua, trinh luat, trinh luan
dan cua » dan ca, ban cua, dai cua

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