Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
cam luc » cam xuc, cau luc
hieu ve » hieu va, hieu van
cuu tre » cau tren, cau treo
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
luc va » duc va, tuc va, loc va
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach y ((nang xa) or (nang ma)) hoi. hieu ve cam luc va hanh vi ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y ((nang xa) OR (nang ma)) hoi. hieu ve cam luc va hanh vi ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach y ((nang xa) or (nang ma)) hoi. hieu ve cam luc va hanh vi ((cua tre) OR (cuu tre))*".