Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
hieu quang » thieu quang, hieu quan, hieu qua
suat nhung » thuat nhung, suat thong, cua nhung
hieu lang » chieu sang, nhieu tang, hieu van
hanh nang » anh nang, ganh nang, hanh mang
van toan » van tuan, van thanh, manh toan
van tan » van tuan, van ban, van tai

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 lang) or (hieu quang)) - hanh nang suat nhung phuong ((van toan) OR (van tan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu lang) OR (hieu quang)) - hanh nang suat nhung phuong ((van toan) OR (van tan)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu lang) or (hieu quang)) - hanh nang suat nhung phuong ((van toan) OR (van tan)) ban".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) or (hieu quang)) - hanh nang suat nhung phuong ((van toan) OR (van tan)) ban*.