Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
duc manh » suc manh, duc anh, duc minh
thu nang » thi nang, thu hang, tho nang
thu bang » thu ban, thu hang, chu bang
cao hoc » co hoc, cho hoc, chat hoc
hieu ve » hieu va, hieu van
duc van » duc va, duc tan, duc phan
cua cau » cua cac, cua chu, cua cay
ve cac » va cac, vien cac
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((thu nang) OR (thu bang)) cao hoc. hieu ve cac ((duc van) OR (duc manh)) hanh vi cua cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((thu nang) or (thu bang)) cao hoc. hieu ve cac ((duc van) OR (duc manh)) hanh vi cua cau~".
• Adding a wildcard symbol may retrieve word variants: toc sach ((thu nang) or (thu bang)) cao hoc. hieu ve cac ((duc van) OR (duc manh)) hanh vi cua cau*.