Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dau tren » dat tren, dau tieng, dau trong
thanh va » thanh van, hanh va, thanh ha
va thanh » gia thanh, ban thanh, va tinh
chat soc » cham soc, chat hoc, chat doc
dau tien » van tien
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
va chat » van chat, va phat, cao chat
soc va » hoc va, loc va, doc va

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 y ((nang xa) OR (nang ma)) hoi. lieu va chat soc va thanh va ((dau tren) OR (dau tien))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y ((nang xa) or (nang ma)) hoi. lieu va chat soc va thanh va ((dau tren) OR (dau tien))~".
• Adding a wildcard symbol may retrieve word variants: thu sach y ((nang xa) or (nang ma)) hoi. lieu va chat soc va thanh va ((dau tren) OR (dau tien))*.