Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » thien van, lieu va, hieu ve
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cao hoc » co hoc, cho hoc, chat hoc
hieu va » lieu va, hieu qua
xuc van » luc van, vuc van, xuc ban
duc van » duc va, duc tan, duc manh
cua cau » cua cac, cua chu, cua cay
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: thuoc sach ty nang cao hoc. ((hieu van) 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: thuoc sach ty nang cao hoc. ((hieu van) 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: "thuoc sach ty nang cao hoc. ((hieu van) or (hieu va)) cac ((xuc van) OR (duc van)) anh vi cua cau*".