Perhaps you should try some spelling variations:
sach kem » hanh kem
su triet » su viet, su tien, ve triet
sach ky » sach y, sach ty, sach hay
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cac day » cac dan, cac dai, cac cay
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
sac ky » cac ky, sai ky
di su » doi su, ki su, da 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 cac day va hanh di su triet~.
• 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 cac day va hanh di su triet.
• 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 cac day va hanh di su triet".
• Adding a wildcard symbol may retrieve word variants: tu ((((sach ky) OR (sach kem))) or (sac ky)) nang xa hoi. hieu va cac day va hanh di su triet*.