Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
gian dan » gian lang
dang van » hoang van, hang va
truc van » truc va, thuc van, truc ban
van hanh » van thanh, ban hanh, van anh
qua cau » quan cau, qua cac, qua ca
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: ((te sach) OR (toc sach)) y ((gian dan) or (dang van)) hoa. hieu qua cau truc van hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) y ((gian dan) OR (dang van)) hoa. hieu qua cau truc van hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) y ((gian dan) or (dang van)) hoa. hieu qua cau truc van hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) y ((gian dan) or (dang van)) hoa. hieu qua cau truc van hanh vi cua te*.