Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach kem
van lam » van nam
sach ty » sach y, sach tu, sach thu
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: su ((sach ky) OR (sach ty)) nang x ho. hieu van lam tu ((ban thanh) or (va dan)) ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach ty)) nang x ho. hieu van lam tu ((ban thanh) OR (va dan)) ki su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sach ty)) nang x ho. hieu van lam tu ((ban thanh) or (va dan)) ki su triet".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sach ty)) nang x ho. hieu van lam tu ((ban thanh) or (va dan)) ki su triet*.