Perhaps you should try some spelling variations:
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
soc ban » hoc ban, coc ban, so ban
vu kham » vu khanh
vu cham » va cham, tu cham, qua cham
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang
vi cua » vai cua
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 lang xa hoi. hieu ((vu cham) or (vu kham)) soc ban hanh ((vi cua) or (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty lang xa hoi. hieu ((vu cham) OR (vu kham)) soc ban hanh ((vi cua) OR (di cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty lang xa hoi. hieu ((vu cham) or (vu kham)) soc ban hanh ((vi cua) or (di cua)) tre*.