Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
va thanh » gia thanh, va tinh, le thanh
toc sach » hoc sach, doc sach, thuoc sach
cua viet » ca viet, hoa viet, cua vat
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van bac » van ban, van bao, dan bac
van hac » van hoc, van ha, van hai
lap cua » lai cua, tap cua, lam cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang xa hoi. thi ((van bac) or (van hac)) xuc ((va thanh) OR (ban thanh)) lap cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. thi ((van bac) OR (van hac)) xuc ((va thanh) OR (ban thanh)) lap cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang xa hoi. thi ((van bac) or (van hac)) xuc ((va thanh) OR (ban thanh)) lap cua viet".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. thi ((van bac) or (van hac)) xuc ((va thanh) OR (ban thanh)) lap cua viet*.