Perhaps you should try some spelling variations:
sach doi » sach hoi, sach moi, sach dao
cham luc » cham soc, nhan luc, cham cuu
qua cham » qua hai, qua cac, va cham
vu sach » vu bach, su sach, vu khach
dinh vi » dinh ve, dinh viet, dinh tri
va dinh » van dinh, va kinh, va tinh
cuu tre » cua tre, cau tren, cau treo
tang ma » mang may, tang van
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
luc va » duc va, tuc va, loc va
vi cuu » vi luu, vinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach doi ((((nang xa) or (lang xa))) or (tang ma)) hoi. hieu qua cham luc va dinh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach doi ((((nang xa) OR (lang xa))) OR (tang ma)) hoi. hieu qua cham luc va dinh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: vu sach doi ((((nang xa) or (lang xa))) or (tang ma)) hoi. hieu qua cham luc va dinh vi cuu tre*.