Perhaps you should try some spelling variations:
xanh dai » vanh dai, xanh di, xanh tai
hieu ve » hieu va, hieu van
va xanh » va danh, va hanh, va anh
cua tre » cua te, cuu tre, cua triet
dai hoi » dai hoc, dai hai, dai moi
mai hoi » mai khoi, lai hoi, mai doi
ky tang » ky nang, ky dang, kho tang
sac ky » cac ky, sai ky
ve dat » de dat, va dat, ve dao
vu sac » vu sach, vu san, va sac

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sac ky tang ((mai hoi) OR (dai hoi)). hieu ve dat (nuoc or duoc) va xanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky tang ((mai hoi) OR (dai hoi)). hieu ve dat (nuoc OR duoc) va xanh dai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky tang ((mai hoi) OR (dai hoi)). hieu ve dat (nuoc or duoc) va xanh dai cua tre*".