Perhaps you should try some spelling variations:
nhanh thai » nhanh thi, nhanh thanh, nhanh thang
hanh thai » hinh thai, hanh tai, anh thai
thien van » thi van
cua tre » cua te, cuu tre, cua triet
duc van » duc va, duc tan, duc manh
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
sac ky » cac ky, sai ky
nang o » nang co, nang ho, nang ro
tu sac » tu sach, tu cac, tu san
o lai » o lao

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 o lai. ((hieu ve) OR (thien van)) cac duc van ((hanh thai) OR (nhanh thai)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang o lai. ((hieu ve) or (thien van)) cac duc van ((hanh thai) OR (nhanh thai)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang o lai. ((hieu ve) or (thien van)) cac duc van ((hanh thai) OR (nhanh thai)) cua tre*.