Perhaps you should try some spelling variations:
thuoc sach » nuoc sach, thuat sach, thuoc sinh
hoc sach » hoc sinh, hoc cac, hoc anh
cam luc » cam xuc, cau luc
hanh di » hanh de, hang di, danh di
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
luc va » duc va, tuc va, loc va
va cam » va cham, va cac, va cao

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) OR (hoc sach)) _ lang xa hoi. hieu va cam luc va ((hanh di) or (hanh vi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (hoc sach)) _ lang xa hoi. hieu va cam luc va ((hanh di) OR (hanh vi)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) OR (hoc sach)) _ lang xa hoi. hieu va cam luc va ((hanh di) or (hanh vi)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) OR (hoc sach)) _ lang xa hoi. hieu va cam luc va ((hanh di) or (hanh vi)) cuu tre*.