Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
hai cua » thai cua, dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ky sang » ky dang, ky tang, duy sang
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
va dan » ca dan, va dao, va dau

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

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