Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
thu nang » thi nang, thu hang, thu bang
hieu van » hieu va, thien van, lieu va
nang co » nang cao, nang doc, nang noi
van cau » van dau, van hau, van chat
xuc van » luc van, vuc van, xuc ban
duc van » duc va, duc tan, duc manh
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) OR (hoc sach)) thu nang co hoc. hieu van cau ((xuc van) or (duc van)) hanh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) thu nang co hoc. hieu van cau ((xuc van) OR (duc van)) hanh vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) thu nang co hoc. hieu van cau ((xuc van) or (duc van)) hanh vi cua cau*".