Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
su triet » su viet, su tien, ve triet
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
va cam » va cham, va cac, va cao
cam tu » cam thu, nam tu, dam tu
va dan » ca dan, va dao, va dau
ki su » ky su

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang x ho. lieu va cam tu ((ban thanh) or (va dan)) ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x ho. lieu va cam tu ((ban thanh) OR (va dan)) ki su triet.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x ho. lieu va cam tu ((ban thanh) or (va dan)) ki su triet*.