Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thu sach » tu sach, thuat sach, thuoc sach
dang xay » dang van, van xay
su triet » su viet, ve triet
hieu van » hieu va, thien van, lieu va
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach y, sach ty
van cam » van nam, van lam, van cau
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
su tien » su kien, su hien, tu tieng

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky dang xay hoi. hieu van cam xuc ((va hanh) or (van thanh)) vi ((su triet) or (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky dang xay hoi. hieu van cam xuc ((va hanh) OR (van thanh)) vi ((su triet) OR (su tien)).
• Adding a wildcard symbol may retrieve word variants: thu sach ky dang xay hoi. hieu van cam xuc ((va hanh) or (van thanh)) vi ((su triet) or (su tien))*.