Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
toc sach » hoc sach, doc sach, thuoc sach
cuoc van » cuoi van, luoc van, quoc van
cac cuoc » cac nuoc, ca cuoc, cac quoc
nang cho » nang chon, ngang cho, nang cao
van anh » van thanh, tuan anh, van minh
hieu ve » hieu va
cho hoc » co hoc, khoa hoc
ty nang » ky nang, ty xang, ty hang
anh vi » hanh vi, anh va, anh ve
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: ((te sach) or (toc sach)) ty nang cho hoc. ((hieu ve) OR (hieu van)) cac cuoc van anh vi cua cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty nang cho hoc. ((hieu ve) OR (hieu van)) cac cuoc van anh vi cua cac*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ty nang cho hoc. ((hieu ve) OR (hieu van)) cac cuoc van anh vi cua cac*".