Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hieu ha » hieu hoa, hieu va, hieu ca
nam mua » nam cua, nam qua, nam xua
danh vi » hanh vi, danh di, danh va
dinh vi » dinh ve, dinh viet, dinh tri
cuu tre » cua tre, cau treo
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
mua va » vua va, sua va, xua va
x hoi » xa hoi, o hoi, x ho

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 x hoi. hieu ha nam mua va ((danh vi) or (dinh vi)) ((cuu tre) OR (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang x hoi. hieu ha nam mua va ((danh vi) OR (dinh vi)) ((cuu tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang x hoi. hieu ha nam mua va ((danh vi) or (dinh vi)) ((cuu tre) OR (cau tren))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang x hoi. hieu ha nam mua va ((danh vi) or (dinh vi)) ((cuu tre) OR (cau tren))*.