Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
va thanh » gia thanh, va tinh, le thanh
va tuyen » va truyen, tac tuyen
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
qua cac » cua cac
cac tuc » cac toc, cac tu, cac tac

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky lang xa hoi. hieu qua cac tuc ((va thanh) or (ban thanh)) ket ((va tuyen) OR (ke tuyen))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang xa hoi. hieu qua cac tuc ((va thanh) OR (ban thanh)) ket ((va tuyen) OR (ke tuyen)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang xa hoi. hieu qua cac tuc ((va thanh) or (ban thanh)) ket ((va tuyen) OR (ke tuyen))".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang xa hoi. hieu qua cac tuc ((va thanh) or (ban thanh)) ket ((va tuyen) OR (ke tuyen))*.