Perhaps you should try some spelling variations:
hanh thang » nhanh thang, thanh thang, hanh trang
hieu lang » chieu sang, hieu quang, nhieu tang
hoi hieu » hoi phieu, hoi tieu, moi hieu
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap
he dung » te dung, nghe dung, hoc dung
he dong » ha dong, de dong, he cong

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoi hieu lang - hanh thang ((he dung) OR (he dong)) cong dan toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi hieu lang - hanh thang ((he dung) OR (he dong)) cong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: hoi hieu lang - hanh thang ((he dung) OR (he dong)) cong dan toan cao*.