Perhaps you should try some spelling variations:
trinh chua » trinh chuan, trinh chu, tinh chua
trinh cua » tinh cua, trinh luat, trinh quan
hang cong » dang cong, hang nong, bang 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) or (trinh cua)) hang 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) OR (trinh cua)) hang cong ((dan than) OR (dan chan)) cao.
• Adding a wildcard symbol may retrieve word variants: doi chi sach - hanh ((trinh chua) or (trinh cua)) hang cong ((dan than) or (dan chan)) cao*.