Perhaps you should try some spelling variations:
phuong hang » phuong hoang, phuong bang, phuong hanh
hieu quang » thieu quang, hieu quan, hieu qua
hieu sang » chieu sang, hieu lang, nhieu tang
truong va » truong dai, truong cao, truong dao
trung va » trang va, trung ha, trung tam
tuan chu » tuan thu, quan chu, tan chu
va tuan » van tuan, va quan, va toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu sang) or (hieu quang)) - thanh ((trung va) OR (truong va)) phuong hang va tuan chu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sang) OR (hieu quang)) - thanh ((trung va) OR (truong va)) phuong hang va tuan chu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu sang) or (hieu quang)) - thanh ((trung va) OR (truong va)) phuong hang va tuan chu".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sang) or (hieu quang)) - thanh ((trung va) OR (truong va)) phuong hang va tuan chu*.