Perhaps you should try some spelling variations:
sach hanh » sach danh, sac hanh, sach tranh
sach nhan » sach nha, sach ngan, cach nhanh
toc sach » hoc sach, doc sach, thuoc sach
hanh xay » hanh may, manh xay, anh xay
sach han » sach tham, sach danh, sach nang
xay khi » nhay khi
ky khi » ky thi, ly khi

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 hanh xay khi đong luc ) or ( su ((sach nhan) or (sach han)) ky khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( toc sach hanh xay khi đong luc ) OR ( su ((sach nhan) OR (sach han)) ky khi đong luc )).
• Adding a wildcard symbol may retrieve word variants: (( toc sach hanh xay khi đong luc ) or ( su ((sach nhan) or (sach han)) ky khi đong luc ))*.