Perhaps you should try some spelling variations:
sach ngang » sach nang, sach quang, sang ngang
thuat sach » thuat lanh, thuat san
sach ngan » sach nha, sach han, sach nang
ngan cong » nganh cong, nganh nong, ngan hang
sach ngon » danh ngon, canh ngon, gach ngoi
cong khi » cong thai, khong khi, co khi
cho khi » co khi, cho ghi, cao khai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( thuat sach ngan cong khi đong luc ) or ( thuat ((sach ngang) OR (sach ngon)) cho khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thuat sach ngan cong khi đong luc ) OR ( thuat ((sach ngang) OR (sach ngon)) cho khi đong luc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( thuat sach ngan cong khi đong luc ) or ( thuat ((sach ngang) OR (sach ngon)) cho khi đong luc ))".
• Adding a wildcard symbol may retrieve word variants: (( thuat sach ngan cong khi đong luc ) or ( thuat ((sach ngang) OR (sach ngon)) cho khi đong luc ))*.