Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
van cam » van nam, van lam, van cau
duc van » duc tan, duc manh, duc phan
cua tre » cuu tre, cua triet, dua tren
tu van » tu va
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu van ky dang xa hoi. hieu van cam ((duc van) OR (duc va)) hanh vi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu van ky dang xa hoi. hieu van cam ((duc van) OR (duc va)) hanh vi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu van ky dang xa hoi. hieu van cam ((duc van) OR (duc va)) hanh vi ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu van ky dang xa hoi. hieu van cam ((duc van) OR (duc va)) hanh vi ((cua tre) or (cua te))*.