Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
van thanh » ban thanh, van tuan
cua triet » cua viet, su triet, va triet
qua phan » cua phan, qua than, quang phan
phan luu » phan huu, phap luu, thanh luu
tu sach » thu sach, su sach, tu cach
te sach » toc sach
luu van » cuu van, luan van, luu hanh
vai cua » dai cua, hai cua, lai cua
x hoi » xa hoi, o hoi, 5 hoi

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 (te sach)) ky nang ((x hoi) OR (x ho)). hieu qua phan luu van thanh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang ((x hoi) OR (x ho)). hieu qua phan luu van thanh vai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky nang ((x hoi) OR (x ho)). hieu qua phan luu van thanh vai cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky nang ((x hoi) OR (x ho)). hieu qua phan luu van thanh vai cua triet*.