Perhaps you should try some spelling variations:
trung thang » trung thanh, trung tang, truong thanh
trung tham » trung tam, trung thanh, trung ha
hang trong » hoang trong, thang trong, lang trong
hieu lang » chieu sang, hieu quang, nhieu tang
trong van » trong cac
van tan » van tuan, van ban, van tai
tan tap » toan tap, han tap, tan tat

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chinh sach) or (hieu lang)) - hanh ((trung tham) OR (trung thang)) hang trong van tan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chinh sach) OR (hieu lang)) - hanh ((trung tham) OR (trung thang)) hang trong van tan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chinh sach) or (hieu lang)) - hanh ((trung tham) OR (trung thang)) hang trong van tan tap".
• Adding a wildcard symbol may retrieve word variants: doi ((chinh sach) or (hieu lang)) - hanh ((trung tham) OR (trung thang)) hang trong van tan tap*.