Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
cham cuu » cap cuu, chat cua
tu sach » thu sach, su sach, te sach
nang xa » lang xa, nang ma, mang xa
va doan » va doanh, van doan, va dan
doan ca » doan cap, dan ca, doan va
cuu va » cuu van, cuu ve
ca cua » co cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y ((nang xa) or (nang x)) hoi. hieu qua cham cuu va doan ca cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang xa) OR (nang x)) hoi. hieu qua cham cuu va doan ca cua vat.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang xa) or (nang x)) hoi. hieu qua cham cuu va doan ca cua vat*.