Perhaps you should try some spelling variations:
lanh hai » manh hai, thanh hai, lang chai
van lanh » van anh, van hanh, van manh
tu sach » thu sach, su sach, te sach
cac duc » cac du, cao duc, cac nuoc
hai cua » thai cua, dai cua, hoi cua
cac dac » cac dan, cac dai, cac bac
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
tay hoi » tay ho, tao hoi, tay thai
ky dang » ky nang, ky danh

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang ((tay hoi) OR (toc thai)). hieu ve ((cac duc) OR (cac dac)) van lanh hai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang ((tay hoi) or (toc thai)). hieu ve ((cac duc) OR (cac dac)) van lanh hai cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang ((tay hoi) or (toc thai)). hieu ve ((cac duc) OR (cac dac)) van lanh hai cua tre*.