Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu quang » thieu quang, hieu qua, diep quang
hieu quan » hieu qua, lieu quan, thien quan
trung vat » trung va, trung van, trong vat
dung cong » dung trong
vat dung » van dung, va dung, viet dung
cong van » cong vang, cong san, song van
tuan tap » toan tap, tuan tai, tuyen tap
toan tai » toan tap, doanh tai, toan ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: nho ((hieu quang) OR (hieu quan)) - thanh trung vat dung cong van ((tuan tap) or (toan tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nho ((hieu quang) OR (hieu quan)) - thanh trung vat dung cong van ((tuan tap) OR (toan tai)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "nho ((hieu quang) OR (hieu quan)) - thanh trung vat dung cong van ((tuan tap) or (toan tai))".
• Adding a wildcard symbol may retrieve word variants: nho ((hieu quang) OR (hieu quan)) - thanh trung vat dung cong van ((tuan tap) or (toan tai))*.