Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
hieu van » hieu va, thien van, lieu va
thuc dan » thuc hanh, hoc dan, thuc vat
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
sach ty » sach y, sach tu, sach thu
cua tu » cua tuc, cua su, cua cu
luc va » duc va, tuc va, loc va

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 ty nang xa hoi. hieu van cam ((luc va) or (thuc dan)) hanh vai ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu van cam ((luc va) OR (thuc dan)) hanh vai ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu van cam ((luc va) or (thuc dan)) hanh vai ((cua te) or (cua tu))*.