Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
toc sach » hoc sach, doc sach, thuoc sach
van hanh » ban hanh, van anh, van ban
hieu van » hieu va, thien van, lieu va
van cac » van hac, van cau, van bac
cac luc » cau luc, coc luc, cac nuoc
cho hoc » co hoc, khoa hoc
ty nang » ty xang, ty hang, ly nang
cua cau » cua cac, cua chu, cua cay
vi cua » vai cua, di 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) or (ky nang)) cho hoc. hieu van cac luc ((van hanh) OR (van thanh)) vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ty nang) OR (ky nang)) cho hoc. hieu van cac luc ((van hanh) OR (van thanh)) vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ty nang) or (ky nang)) cho hoc. hieu van cac luc ((van hanh) OR (van thanh)) vi cua cau*".