Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
hieu van » hieu va, thien van, lieu va
thu nang » thi nang, thu hang, thu bang
hoc sach » hoc sinh, hoc cac, hoc anh
nang co » nang cao, nang doc, nang noi
van cac » van hac, van cau, van bac
cac xuc » cam xuc, cac nuoc, chat xuc
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 cac xuc ((van hanh) or (ban 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 cac xuc ((van hanh) OR (ban 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 cac xuc ((van hanh) or (ban hanh)) vi cua cau*".