Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
cham luc » cham soc, nhan luc, cham cuu
cau tren » cu tren, dau tren, ca tren
tu sach » su sach, te sach, tu cach
nang xa » nang x, lang xa, mang xa
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
nang ma » tang ma, sang ma, nang cao
luc va » duc va, tuc va, loc va
vi cau » va cau, ve cau, di cau

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) y ((nang xa) OR (nang ma)) hoi. lieu va cham luc va hanh vi cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (tu sach)) y ((nang xa) or (nang ma)) hoi. lieu va cham luc va hanh vi cau tren~".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (tu sach)) y ((nang xa) or (nang ma)) hoi. lieu va cham luc va hanh vi cau tren*.