Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
gian dan » gian lang
van gian » van giang, dan gian, van giao
dan cua » dan ca, ban cua, dai cua
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
hieu va » hieu qua
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cua te » cua tu
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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 ((x hoi) or (o hoi)). ((hieu va) or (lieu va)) cac xuc van gian dan cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ty nang ((x hoi) OR (o hoi)). ((hieu va) OR (lieu va)) cac xuc van gian dan cua te.
• Adding a wildcard symbol may retrieve word variants: hoc sach ty nang ((x hoi) or (o hoi)). ((hieu va) or (lieu va)) cac xuc van gian dan cua te*.