Perhaps you should try some spelling variations:
cham loc » cham soc, chon loc, cham o
su triet » su tien, ve triet
tu sach » thu sach, su sach, te sach
ty nang » ty xang, ty hang, ly nang
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va hanh » van hanh, va thanh, va danh
su viet » so viet
loc va » hoc va, luc va
x hoi » xa hoi, o hoi, x ho

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 ((ty nang) OR (ky nang)) x hoi. hieu ve cham loc va hanh vi ((su triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ky nang)) x hoi. hieu ve cham loc va hanh vi ((su triet) OR (su viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) OR (ky nang)) x hoi. hieu ve cham loc va hanh vi ((su triet) or (su viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) OR (ky nang)) x hoi. hieu ve cham loc va hanh vi ((su triet) or (su viet))*.