Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, lanh tranh
hanh trang » thanh trung, canh tranh, hanh trinh
hieu quan » hieu qua, lieu quan, thien quan
chau tinh » cuu tinh, ha tinh, cua tinh
dang cong » dung cong
cua dang » cua cong, cua ban
cong van » cong vang, cong san, song van
van toan » van tuan, van tan, van thanh
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu quan) or (chau tinh)) - ((hanh tranh) OR (hanh trang)) cua dang cong van toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu quan) OR (chau tinh)) - ((hanh tranh) OR (hanh trang)) cua dang cong van toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu quan) or (chau tinh)) - ((hanh tranh) OR (hanh trang)) cua dang cong van toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu quan) or (chau tinh)) - ((hanh tranh) OR (hanh trang)) cua dang cong van toan ban*.