Perhaps you should try some spelling variations:
dinh viet » ninh viet, danh viet, trinh viet
nam chua » nam cua, nem chua, kham chua
cuu tre » cua tre, cau tren, cau treo
chua va » chuc va, chua may, chuan ha
hieu ha » hieu hoa, hieu va, hieu xa
danh vi » hanh vi, dinh vi, danh di
hieu ca » hieu cac, hieu cua, hieu va
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
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) OR (hieu ca)) nam chua va ((danh vi) or (dinh viet)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang x hoi. ((hieu ha) OR (hieu ca)) nam chua va ((danh vi) OR (dinh viet)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang x hoi. ((hieu ha) OR (hieu ca)) nam chua va ((danh vi) or (dinh viet)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang x hoi. ((hieu ha) OR (hieu ca)) nam chua va ((danh vi) or (dinh viet)) cuu tre*.