Perhaps you should try some spelling variations:
nhan trong » nhuan trong, nhat trong, nhin trong
manh trung » manh tung, thanh trung, manh hung
khoe sach » hoc sach, khoe sinh, hoa sach
khoa sach » hoc sach
trung cac » truong cac, trung cap, trong cac
trong van » trong cac
cac nhan » ca nhan, cac nha, cam nhan
ban cao » bao cao, ban can, ban co

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((khoe sach) or (khoa sach)) - manh trung cac nhan trong van ban cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((khoe sach) OR (khoa sach)) - manh trung cac nhan trong van ban cao.
• Adding a wildcard symbol may retrieve word variants: doi ((khoe sach) or (khoa sach)) - manh trung cac nhan trong van ban cao*.