Perhaps you should try some spelling variations:
van khanh » van thanh, van anh, van phan
cau tren » cu tren, dau tren, ca tren
thai cau » thai cao, toan cau, thai van
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
cac xuc » cam xuc, cac nuoc, chat xuc
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
co dai » co dan, do dai
ve cac » va cac, vien cac
o hai » co hai, so hai, o lai

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 nang ((o hai) or (co dai)). hieu ve cac xuc ((van khanh) or (van hanh)) thai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((o hai) OR (co dai)). hieu ve cac xuc ((van khanh) OR (van hanh)) thai cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((o hai) or (co dai)). hieu ve cac xuc ((van khanh) or (van hanh)) thai cau tren*.