Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
nhung cong » dung cong, thong cong, hang cong
hieu quan » hieu qua, lieu quan, thien quan
trang va » tran van, hang va
cong dan » cong san, cong tan, huong dan
toan tai » doanh tai, toan cao, von tai
toan ban » van ban
ho hieu » ho chieu, hoi hieu, nho hieu

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

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