Perhaps you should try some spelling variations:
thien van » thi van
hanh thai » nhanh thai, hinh thai, hanh tai
thai cua » than cua, tai cuc, tri cua
nang co » nang cao, nang doc, nang noi
hieu ve » hieu va, hieu van
duc van » duc tan, duc manh, duc phan
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
co lai » con lai, o lai, co dai

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang co lai. ((hieu ve) OR (thien van)) cac ((duc van) OR (duc va)) hanh thai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang co lai. ((hieu ve) or (thien van)) cac ((duc van) OR (duc va)) hanh thai cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang co lai. ((hieu ve) or (thien van)) cac ((duc van) OR (duc va)) hanh thai cua tre*.