Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh tai » thanh hai, thanh toan, doanh tai
cua triet » cua viet, su triet, va triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
tai cua » thai cua, tai cuc, tri cua
ve cac » va cac, vien cac
do van » dao van, vo van, so van

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 ky nang xa hoi. hieu ((he bac) or (ve cac)) do van thanh tai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ((he bac) OR (ve cac)) do van thanh tai cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu ((he bac) or (ve cac)) do van thanh tai cua triet*.