Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
cau tren » cu tren, ca tren, cau treo
danh vi » hanh vi, dinh vi, danh di
cua tre » cua te, cuu tre, cua triet
va danh » va dinh, va dan, va hanh
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc va
sac ky » cac ky, sai ky
nang o » nang co, nang ho, nang ro
tu sac » tu sach, tu cac, tu san
o hoc » co hoc, mo hoc, so hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang o hoc. hieu ve cam xuc va danh vi ((cua tre) or (((cau tren) OR (dau tren))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang o hoc. hieu ve cam xuc va danh vi ((cua tre) OR (((cau tren) OR (dau tren)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang o hoc. hieu ve cam xuc va danh vi ((cua tre) or (((cau tren) OR (dau tren))))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang o hoc. hieu ve cam xuc va danh vi ((cua tre) or (((cau tren) OR (dau tren))))*.