Perhaps you should try some spelling variations:
nang dau » hang dau, xang dau, nang du
thanh de » hanh de, thanh ve, thanh le
thanh do » thanh pho, thanh hoa, thanh loi
te sach » toc sach
dau hoi » cau hoi, dai hoi, dan hoi
hieu ve » hieu va, hieu van
cac day » cac dan, cac dai, cac cay
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
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: te sach y nang dau hoi. hieu ve cac day va ((thanh de) or (thanh do)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang dau hoi. hieu ve cac day va ((thanh de) OR (thanh do)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: te sach y nang dau hoi. hieu ve cac day va ((thanh de) or (thanh do)) cuu tre*.