Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dang xay » dang van, van xay
va hanh » van hanh, va thanh, va danh
cau luc » cau truc, cau phuc
qua cau » quan cau, qua cac, qua ca
lang ha » long ha
lang xa » lang van
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua
cua te » cua tu

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 y ((((lang xa) OR (dang xay))) or (lang ha)) hoi. hieu qua cau luc va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y ((((lang xa) OR (dang xay))) OR (lang ha)) hoi. hieu qua cau luc va hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y ((((lang xa) OR (dang xay))) or (lang ha)) hoi. hieu qua cau luc va hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: toc sach y ((((lang xa) OR (dang xay))) or (lang ha)) hoi. hieu qua cau luc va hanh vi cua te*.