Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
dau tien » van tien
mang xa » lang xa, mang may, dang xay
hieu va » lieu va, hieu qua
cac xuc » cam xuc, chat xuc, cac cuoc
y mang » cay mang
anh vi » anh va, anh ve, anh vu

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 mang xa hoi. hieu va ((cac xuc) or (cac nuoc)) van ((anh vi) OR (hanh vi)) dau tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y mang xa hoi. hieu va ((cac xuc) OR (cac nuoc)) van ((anh vi) OR (hanh vi)) dau tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach y mang xa hoi. hieu va ((cac xuc) or (cac nuoc)) van ((anh vi) OR (hanh vi)) dau tien".
• Adding a wildcard symbol may retrieve word variants: thuoc sach y mang xa hoi. hieu va ((cac xuc) or (cac nuoc)) van ((anh vi) OR (hanh vi)) dau tien*.