Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
thu sach » thuat sach, thuoc sach, thu hoach
hieu van » hieu va, thien van, lieu va
va triet » va thiet, va trien, ve triet
tu sach » su sach, te sach, tu cach
van bac » van ban, van bao, van hac
duc gia » quoc gia
hai va » hai van, thai va, hoi va
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) ky nang x hoi. hieu van bac duc gia thanh hai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang x hoi. hieu van bac duc gia thanh hai va triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang x hoi. hieu van bac duc gia thanh hai va triet*.