Perhaps you should try some spelling variations:
ban hanh » ban hang
sach kem » hanh kem
sach ky » sach y, sach ty, sach hay
hanh ki » hanh vi, hanh ky, hanh kien
dua ban » dia ban, cua ban, qua ban
cam dua » ca dua, cay dua, chay dua
hieu va » lieu va, hieu qua
su viet » so viet
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao
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: tu ((((sach ky) OR (sach kem))) or (sac ky)) nang xa hoi. hieu va cam dua ban hanh ki su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((((sach ky) OR (sach kem))) OR (sac ky)) nang xa hoi. hieu va cam dua ban hanh ki su viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((((sach ky) OR (sach kem))) or (sac ky)) nang xa hoi. hieu va cam dua ban hanh ki su viet".
• Adding a wildcard symbol may retrieve word variants: tu ((((sach ky) OR (sach kem))) or (sac ky)) nang xa hoi. hieu va cam dua ban hanh ki su viet*.