Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
nang cho » nang chon, ngang cho, nang cao
cuoi van » cuoi dan, cuu van, bui van
cac cuoi » cac cuoc, dam cuoi, cac co
sach ty » sach y, sach tu, sach thu
te sach » toc sach
hieu va » lieu va, hieu qua
cho hoc » co hoc, khoa hoc
ty nang » ky nang, ty xang, ty hang
cua cau » cua cac, cua chu, cua cay
anh vi » hanh vi, anh va, anh vu
anh ve » hanh ve, anh va, anh viet

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 ty nang cho hoc. ((hieu va) or (hieu van)) cac cuoi van ((anh vi) OR (anh ve)) cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang cho hoc. ((hieu va) OR (hieu van)) cac cuoi van ((anh vi) OR (anh ve)) cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang cho hoc. ((hieu va) or (hieu van)) cac cuoi van ((anh vi) OR (anh ve)) cua cau*".