Perhaps you should try some spelling variations:
sach ky » sac ky, sach y, sach kem
va hanh » van hanh, va thanh, va danh
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
ca tren » cau tren, cu tren, la tren
sach ty » sach y, sach tu, sach thu
ve cac » va cac, vien cac
xuc va » duc va, tuc va, luc va
co hoi » co loi
vi ca » vit ca, li ca, va ca

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ky) OR (sach ty)) nang ((co hoc) or (co hoi)). hieu ve cac xuc va hanh vi ca tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach ty)) nang ((co hoc) OR (co hoi)). hieu ve cac xuc va hanh vi ca tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) OR (sach ty)) nang ((co hoc) or (co hoi)). hieu ve cac xuc va hanh vi ca tren".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) OR (sach ty)) nang ((co hoc) or (co hoi)). hieu ve cac xuc va hanh vi ca tren*.