Perhaps you should try some spelling variations:
quan nhung » qua nhung, cua nhung, luan chung
hieu quang » thieu quang, hieu quan, hieu qua
nhung tung » nhung tuong, nhung dung, nhung vung
hanh nang » anh nang, ganh nang, hanh mang
nang quan » ban quan, nang suat
hieu van » hieu va, thien van, lieu va
dan than » dan chan, van than, dan toan
ban than » ban thanh, van thanh, ban hang

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((hieu quang) or (hieu van)) - hanh nang quan nhung tung ((dan than) OR (ban than)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu quang) OR (hieu van)) - hanh nang quan nhung tung ((dan than) OR (ban than)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu quang) or (hieu van)) - hanh nang quan nhung tung ((dan than) OR (ban than)) ban".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu quang) or (hieu van)) - hanh nang quan nhung tung ((dan than) OR (ban than)) ban*.