Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
xuc van » duc van, luc van, xuc ban
ve tai » te tai, de tai, le tai
cua tu » cua tuc, cua cu, cua te
cua su » qua su

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 ky nang xa hoi. hieu ((ve tai) or (va cac)) xuc van hanh vi ((cua tu) or (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ((ve tai) OR (va cac)) xuc van hanh vi ((cua tu) OR (cua su)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu ((ve tai) or (va cac)) xuc van hanh vi ((cua tu) or (cua su))*.