Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
tai cua » thai cua, tai cuc, tri cua
luu van » cuu van, luan van, luu hanh
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach ty, sach kem
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) OR (sach y)) nang x hoi. hieu ve cac ((duc van) or (luu van)) hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) nang x hoi. hieu ve cac ((duc van) OR (luu van)) hanh tai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sach y)) nang x hoi. hieu ve cac ((duc van) or (luu van)) hanh tai cua tre*".