Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
duc manh » suc manh, duc anh, duc minh
dang xay » dang van, van xay
tuan vi » quan vi, luan vi, quans vi
sach tu » sach thu, cach tu, sach ty
hieu va » lieu va, hieu qua
lang xa » lang ha, lang van
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
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 tu ((lang xa) OR (dang xay)) hoi. hieu va cam ((duc manh) or (duc tan)) tuan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tu ((lang xa) OR (dang xay)) hoi. hieu va cam ((duc manh) OR (duc tan)) tuan vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach tu ((lang xa) OR (dang xay)) hoi. hieu va cam ((duc manh) or (duc tan)) tuan vi cua tre*".