Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
toc sach » hoc sach, doc sach, thuoc sach
thu sach » tu sach, thuat sach, thuoc sach
lam xuc » cam xuc, lam duoc
van lam » van nam
nang o » nang co, nang ho, nang ro
xuc va » duc va, tuc va, luc va
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu
o hoi » co hoi, o hoc, o hai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((((te sach) or (toc sach))) or (thu sach)) ky nang o hoi. hieu van lam xuc va dan vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((te sach) OR (toc sach))) OR (thu sach)) ky nang o hoi. hieu van lam xuc va dan vi cua tu.
• Adding a wildcard symbol may retrieve word variants: ((((te sach) or (toc sach))) or (thu sach)) ky nang o hoi. hieu van lam xuc va dan vi cua tu*.