Perhaps you should try some spelling variations:
truong cong » trong cong, truong dong, truong long
canh trinh » canh tranh, hanh trinh, canh tinh
trinh cac » trinh cau, trinh chat, trinh chao
doc hieu » toc thieu, hoc thieu
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
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: ((doc hieu) or (hoc hien)) tinh - canh trinh cac truong cong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (hoc hien)) tinh - canh trinh cac truong cong dan toan ban.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (hoc hien)) tinh - canh trinh cac truong cong dan toan ban*.