Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
doanh va » doan va, doanh tai, doanh cua
cham luc » cham soc, nhan luc, cham cuu
sang ma » tang ma, nang ma, sang tao
va cham » va chat, va tham
danh va » hanh va, anh va, dan va
cu tren » tu tren, dua tren
luc va » duc va, tuc va, loc va

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