Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
cham loc » cham soc, chon loc, cham o
vai cau » va cau, van cau, vai cac
va tinh » may tinh
va dinh » van dinh, va kinh, vu dinh
tu sach » thu sach, su sach, te sach
hieu vu » hieu va, hieu ve, hieu su
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
vu cham » va cham, vu kham, tu cham

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 (ty hang)) xa hoi. hieu vu cham loc ((va dinh) OR (va tinh)) vai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ty hang)) xa hoi. hieu vu cham loc ((va dinh) OR (va tinh)) vai cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) or (ty hang)) xa hoi. hieu vu cham loc ((va dinh) OR (va tinh)) vai cau tren".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ty hang)) xa hoi. hieu vu cham loc ((va dinh) OR (va tinh)) vai cau tren*.