Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
toc sach » hoc sach, doc sach, thuoc sach
thanh ve » hanh ve, thanh va, thanh vien
nang cho » nang chon, ngang cho, nang cao
van hac » van hoc, van ha, van hai
vuc ban » vu ban, duc ban, cuc ban
cua cau » cua cac, cua chu, cua cay
van bac » van ban, van bao, dan bac
sach ty » sach y, sach tu, sach thu
van cau » van dau, van hau, van chat
cho hoc » co hoc, khoa hoc
ty nang » ky nang, ty xang, ty hang
ve cua » le cua, de cua, te cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ty nang cho hoc. hieu ((((van cau) or (van bac))) or (van hac)) vuc ban thanh ve cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang cho hoc. hieu ((((van cau) OR (van bac))) OR (van hac)) vuc ban thanh ve cua cau*.