Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cam cua » ca cua, nam cua, cau cua
sach ky » sach y, sach ty, sach kem
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
vai va » mai va, hai va, lai va
dai va » mai va
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) or (sac ky)) nang xa hoi. hieu va cam cua ban thanh ((vai va) OR (dai va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang xa hoi. hieu va cam cua ban thanh ((vai va) OR (dai va)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sac ky)) nang xa hoi. hieu va cam cua ban thanh ((vai va) OR (dai va)) triet*".