Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, hieu quan
trien quang » tran quang, tuyen quang, dien quang
cong ngang » cong nhan, cong quang, cong lang
tranh va » tranh van, trang va, trinh va
cong van » cong vang, cong san, song van
tuan cau » toan cau, quan cau, tuan cu

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 quang) OR (trien quang)) - canh tranh va nhung ((cong van) or (cong ngang)) tuan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu quang) OR (trien quang)) - canh tranh va nhung ((cong van) OR (cong ngang)) tuan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu quang) OR (trien quang)) - canh tranh va nhung ((cong van) or (cong ngang)) tuan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu quang) OR (trien quang)) - canh tranh va nhung ((cong van) or (cong ngang)) tuan cau*.