Perhaps you should try some spelling variations:
banh vai » hanh vi, ban va, hanh va
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
cac ban » cac dan, can ban, cac bai
vai cua » dai cua, hai cua, lai cua
cac van » cac dan
sach ky » sac ky, sach y, sach ty
van cam » van nam, van lam, van cau
nang xa » nang x, lang xa, nang ma
cua te » cua tu

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) or (nang cao)) hoi. hieu van cam ((cac ban) OR (cac van)) banh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (nang cao)) hoi. hieu van cam ((cac ban) OR (cac van)) banh vai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) or (nang cao)) hoi. hieu van cam ((cac ban) OR (cac van)) banh vai cua te*".