Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
dinh ban » dinh bang, dinh van, dinh ba
thuc van » thuc vat, thuc dan, thuc va
tuc van » truc van, tuc va, duc van
ty nang » ky nang, ty xang, ly nang
ban cua » ban quan
ty hang » ly hang, ty xang, thi hang
va cam » va cham, va cac, va cao
cua te » cua tu
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 ((ty nang) or (ty hang)) x hoi. lieu va cam ((tuc van) OR (thuc van)) dinh ban cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((ty nang) OR (ty hang)) x hoi. lieu va cam ((tuc van) OR (thuc van)) dinh ban cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((ty nang) or (ty hang)) x hoi. lieu va cam ((tuc van) OR (thuc van)) dinh ban cua te".
• Adding a wildcard symbol may retrieve word variants: hoc sach ((ty nang) or (ty hang)) x hoi. lieu va cam ((tuc van) OR (thuc van)) dinh ban cua te*.