Perhaps you should try some spelling variations:
thanh do » thanh pho, thanh hoa, thanh loi
thanh de » hanh de, thanh ve, thanh le
cuu tre » cua tre, cau tren, cau treo
dau hoi » cau hoi, dai hoi, dau noi
dan hoi » dan hoc, dai hoi, van hoi
hieu ve » hieu va, hieu van
cac dac » cac dan, cac dai, cac bac
te sac » te sach, te cac, te san
dac va » duc va, day va, dat va
sac ky » cac ky, sai ky
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 sac ky nang ((dau hoi) or (dan hoi)). hieu ve cac dac va ((thanh de) or (thanh do)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang ((dau hoi) OR (dan hoi)). hieu ve cac dac va ((thanh de) OR (thanh do)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: te sac ky nang ((dau hoi) or (dan hoi)). hieu ve cac dac va ((thanh de) or (thanh do)) cuu tre*.