Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, hinh tai
tang van » dang van, hoang van, trong van
sach ky » sac ky, sach ty, sach kem
han tai » hang tai, nhan tai, van tai
cac toc » cac toi, cac nuoc, cac thoi
hieu va » lieu va, hieu qua
van hoi » van hoa, van hoc, van hoe
cua tre » cua te, cuu tre, cua triet
toc va » hoc va, toc ta, tuc va

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)) tang van hoi. hieu va cac toc va ((hanh tai) or (han tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) tang van hoi. hieu va cac toc va ((hanh tai) OR (han tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sach y)) tang van hoi. hieu va cac toc va ((hanh tai) or (han tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) OR (sach y)) tang van hoi. hieu va cac toc va ((hanh tai) or (han tai)) cua tre*.