Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
cam duc » cam xuc, cao duc, pham duc
luy tre » luyen tre
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (vu bach)) ky nang xa hoi. hieu van cam duc va dan vi ((luy tre) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (vu bach)) ky nang xa hoi. hieu van cam duc va dan vi ((luy tre) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu bach)) ky nang xa hoi. hieu van cam duc va dan vi ((luy tre) or (cua tu))*.