Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
van hanh » van thanh, ban hanh, van anh
hieu van » thien van, lieu va, hieu ve
cua viet » ca viet, hoa viet, cua vat
ly nang » ky nang, ly hang, ly vang
hieu va » lieu va, hieu qua
cam luc » cam xuc, cau luc
luc van » luoc van, luu van, duc van
hanh ve » hanh vi, hanh va, hanh kem
y nang » ky nang, v nang, may nang
ve cua » le cua, de cua, te cua
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: hoc sach ((y nang) or (ly nang)) x hoi. ((hieu van) or (hieu va)) cam luc van hanh ve cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((y nang) OR (ly nang)) x hoi. ((hieu van) OR (hieu va)) cam luc van hanh ve cua viet.
• Adding a wildcard symbol may retrieve word variants: hoc sach ((y nang) or (ly nang)) x hoi. ((hieu van) or (hieu va)) cam luc van hanh ve cua viet*.