Perhaps you should try some spelling variations:
nghiep tong » nghiep trong, nghiep thong, nghiep dong
nghiep nong » nghiep trong, nghiep nhung, nghiem song
chinh cong » thanh cong, trinh cong
hieu sach » chieu sach, hieu cach, dien sach
doc hieu » toc thieu, hoc thieu, hoc hien
cong san » cong tac
san tai » sang tai, van tai, han tai
tai cao » thai cao, tao cao, tai sao

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 sach - chinh cong ((nghiep tong) or (nghiep nong)) cong san tai cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - chinh cong ((nghiep tong) OR (nghiep nong)) cong san tai cao.
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - chinh cong ((nghiep tong) or (nghiep nong)) cong san tai cao*.