Perhaps you should try some spelling variations:
thinh sach » chinh sach, tinh sach, sinh sach
hanh trinh » canh tranh, hanh chinh
trinh quan » tinh quang, trinh luat, trinh han
quan dung » quang dung, quan duong, qua dung
dung cong » dung trong
van thuan » van tuan, van than, van quan
van chat » cao chat
tien » tieng, bien, vien

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

• Performing a fuzzy search may retrieve terms with similar spellings: tien thinh sach - hanh trinh quan dung cong ((van chat) or (van thuan)) cam~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tien thinh sach - hanh trinh quan dung cong ((van chat) OR (van thuan)) cam.
• Adding a wildcard symbol may retrieve word variants: tien thinh sach - hanh trinh quan dung cong ((van chat) or (van thuan)) cam*.