Perhaps you should try some spelling variations:
theo yeu » theo tieu, thiet yeu, theo chu
yeu tinh » yeu tin, lieu tinh, kieu tinh
anh tang » anh bang, anh dang, anh nang
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan cao » toan ban, toan tap
tang va » trang va, tang van, thang va

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo yeu tinh - anh tang va thuong ((cong dan) OR (cong san)) toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo yeu tinh - anh tang va thuong ((cong dan) OR (cong san)) toan cao".
• Adding a wildcard symbol may retrieve word variants: theo yeu tinh - anh tang va thuong ((cong dan) OR (cong san)) toan cao*.