Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
su triet » su viet, su tien, ve triet
hieu va » lieu va, hieu qua
sach ky » sach y, sach ty, sach kem
va lam » van lam, va lap
sac ky » cac ky, sai ky
va dan » ca dan, va dao, va dau
lam tu » nam tu, cam tu, dam tu
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) OR (sac ky)) nang x ho. hieu va lam 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) OR (sac ky)) nang x ho. hieu va lam tu ((ban thanh) OR (va dan)) ki su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach ky) OR (sac ky)) nang x ho. hieu va lam tu ((ban thanh) or (va dan)) ki su triet".
• Adding a wildcard symbol may retrieve word variants: vu ((sach ky) OR (sac ky)) nang x ho. hieu va lam tu ((ban thanh) or (va dan)) ki su triet*.