Perhaps you should try some spelling variations:
trung thuoc » trung thuc, trung quoc, trung hoc
trong thuc » trong thu, thuong thuc, trong thuat
tong cong » trong cong, cong cong, dung cong
chi sach » chinh sach, chieu sach, co sach
cong tac » cong ty
doi chi » doi khi
tac van » tac vang, cac van, tac va

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 - sinh ((trung thuoc) or (trong thuc)) tong cong tac van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi sach - sinh ((trung thuoc) OR (trong thuc)) tong cong tac van ban.
• Adding a wildcard symbol may retrieve word variants: doi chi sach - sinh ((trung thuoc) or (trong thuc)) tong cong tac van ban*.