Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thu sach » tu sach, thuat sach, thuoc sach
van cam » van nam, van lam, van cau
te sach » toc sach
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
cua su » qua su
cua cu » cua chu, cua cau, cua co
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 (thu sach)) ky nang o hoi. hieu van cam xuc va dan vi ((cua su) or (cua cu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu sach)) ky nang o hoi. hieu van cam xuc va dan vi ((cua su) OR (cua cu)).
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu sach)) ky nang o hoi. hieu van cam xuc va dan vi ((cua su) or (cua cu))*.