Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nang cho » nang chon, ngang cho, nang cao
hieu va » lieu va, hieu qua
duc van » duc va, duc tan, duc manh
xuc van » luc van, vuc van, xuc ban
cua cau » cua cac, cua chu, cua cay
sach ty » sach y, sach tu, sach thu
hieu ve » hieu van
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: toc sach ty nang cho hoc. ((hieu ve) OR (hieu va)) cac ((xuc van) or (duc van)) anh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang cho hoc. ((hieu ve) OR (hieu va)) cac ((xuc van) OR (duc van)) anh vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty nang cho hoc. ((hieu ve) OR (hieu va)) cac ((xuc van) or (duc van)) anh vi cua cau*".