Perhaps you should try some spelling variations:
thien van » thi van
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, lieu va, hieu ve
cuc ban » cua ban, cuu ban, duc ban
hanh di » hanh vi, hanh de, hang di
cac ban » cac dan, cac van, can ban
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
di cua » dai cua, doi cua, de cua

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) or (thien van)) cau ((cuc ban) or (cac ban)) hanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. ((hieu van) OR (thien van)) cau ((cuc ban) OR (cac ban)) hanh di cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. ((hieu van) or (thien van)) cau ((cuc ban) or (cac ban)) hanh di cua viet*.