Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh chua » trinh chuan, trinh cua, trinh chu
chua dang » cua dang, chua dong, chua nang
dang cong » dung cong
chi sach » chinh sach, chieu sach, co sach
dan than » ban than, van than, dan toan
dan chan » dan gian, dan ca, van chat
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chi sach - hanh trinh chua dang cong ((dan than) or (dan chan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi sach - hanh trinh chua dang cong ((dan than) OR (dan chan)) cao.
• Adding a wildcard symbol may retrieve word variants: doi chi sach - hanh trinh chua dang cong ((dan than) or (dan chan)) cao*.