Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cham luc » cham soc, nhan luc, cham cuu
tang ma » mang may, tang van
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
va cham » va chat, va tham
cu tren » tu tren, dua tren
nang ma » sang ma, nang cao, mang may
mang xa » lang xa, mang may, dang xay
luc va » duc va, tuc va, loc va
va cu » va cau, va chu, va su

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 ((mang xa) or (((nang ma) OR (tang ma)))) hoi. lieu va cham luc va hanh va cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((mang xa) OR (((nang ma) OR (tang ma)))) hoi. lieu va cham luc va hanh va cu tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y ((mang xa) or (((nang ma) OR (tang ma)))) hoi. lieu va cham luc va hanh va cu tren*".