Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
van cac » van cau, van bac, dan cac
van hac » van hoc, van ha, van hai
dac ban » cac ban, dac san, duc ban
dat cua » dai cua, mat cua, dan cua
day cua » dai 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 ky nang x ho. hieu ((van cac) or (van hac)) dac ban thanh ((dat cua) OR (day cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x ho. hieu ((van cac) OR (van hac)) dac ban thanh ((dat cua) OR (day cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x ho. hieu ((van cac) or (van hac)) dac ban thanh ((dat cua) OR (day cua)) tre*".