Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
thieu sang » chieu sang, thieu khang, hieu lang
tranh cua » doanh cua, manh cua
nong cong » cong cong, tong cong, dong cong
nang cong » nang song, dang cong, bang cong
tan phan » toan phan, than phan, van phan
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 tranh cua ((nong cong) or (nang cong)) tan phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (thieu quang)) - canh tranh cua ((nong cong) OR (nang cong)) tan phan dau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) OR (thieu quang)) - canh tranh cua ((nong cong) or (nang cong)) tan phan dau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) OR (thieu quang)) - canh tranh cua ((nong cong) or (nang cong)) tan phan dau*.