Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
hanh dai » hanh tai, hanh dao, vanh dai
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
duoc va » nuoc va, duoc ma, duong va
cua tre » cua te, cuu tre, cua triet
vu cac » va cac, tu cac, ve cac
ve dat » de dat, va dat, ve dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu cac ky nang mai hoi. hieu ve dat ((duoc va) or (duc va)) hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu cac ky nang mai hoi. hieu ve dat ((duoc va) OR (duc va)) hanh dai cua tre*.