Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cham luc » cham soc, nhan luc, cham cuu
dau tren » dau tien, dat tren, dau tieng
nang xa » lang xa, mang xa, ang xa
nang ma » tang ma, sang ma, nang cao
va cham » va chat, va tham
va danh » va dinh, va dan, va hanh
danh va » doanh va, hanh va, anh va
luc va » duc va, tuc va, loc va
va dau » va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y ((((nang xa) or (nang x))) or (nang ma)) hoi. lieu va cham luc va danh va dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((((nang xa) OR (nang x))) OR (nang ma)) hoi. lieu va cham luc va danh va dau tren*.