Perhaps you should try some spelling variations:
lang hai » lang chai, lang thai, lang ha
hai muoi » tai mui
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
tai cua » thai cua, tai cuc, tri cua
luc van » luoc van, luu van, duc van
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
va cam » va cham, va cac, va cao
ve cac » va cac, vien cac

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 lang hai muoi. hieu ((ve cac) or (va cam)) luc van hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang hai muoi. hieu ((ve cac) OR (va cam)) luc van hanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang hai muoi. hieu ((ve cac) or (va cam)) luc van hanh tai cua tre*.