Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
lanh chung » doanh chung, manh hung, luan chung
chung chuc » chung chuan, chuong chua, chung cu
hieu tinh » lieu tinh, kieu tinh, hieu binh
van thanh » ban thanh, van tuan
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: doc ((hieu tinh) OR (chieu tinh)) - lanh chung chuc nang song ((van tan) or (van thanh)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu tinh) OR (chieu tinh)) - lanh chung chuc nang song ((van tan) OR (van thanh)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu tinh) OR (chieu tinh)) - lanh chung chuc nang song ((van tan) or (van thanh)) ban".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu tinh) OR (chieu tinh)) - lanh chung chuc nang song ((van tan) or (van thanh)) ban*.