Perhaps you should try some spelling variations:
ban thanh » ban hang
cua triet » cua viet, su triet, va triet
ban hanh » ban hang
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
cam dua » ca dua, cay dua, chay dua
cua tre » cua te, cuu tre, dua tren
va cam » va cham, va cac, va cao

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. lieu va cam dua ((ban thanh) OR (ban hanh)) san ((cua tre) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang xa hoi. lieu va cam dua ((ban thanh) or (ban hanh)) san ((cua tre) OR (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. lieu va cam dua ((ban thanh) or (ban hanh)) san ((cua tre) OR (cua triet))*.