Perhaps you should try some spelling variations:
sach ngang » sach nang, sach ngan, sach ngon
ngang cho » nang cho, ngang tho, sang cho
dung cong » dung trong
toc sach » hoc sach, doc sach, thuoc sach
cong khi » cong thai, khong khi, co khi
tu sach » thu sach, su sach, te sach
cho khi » co khi, cho ghi, cao khai

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: (( tu sach ngang cho khi đong luc ) OR ( toc sach dung cong khi đong luc ))~.
• Adding a wildcard symbol may retrieve word variants: (( tu sach ngang cho khi đong luc ) or ( toc sach dung cong khi đong luc ))*.