Perhaps you should try some spelling variations:
nhanh thai » nhanh thi, nhanh thanh, nhanh thang
hieu van » hieu va, thien van, lieu va
thai cua » than cua, tai cuc, tri cua
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 » cua te, cuu tre, cua triet
su hai » su tai
hai ky » thai ky, hoi ky, hai ly

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

• Performing a fuzzy search may retrieve terms with similar spellings: su hai ky dang xa hoi. hieu van cam ((duc van) or (duc va)) nhanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su hai ky dang xa hoi. hieu van cam ((duc van) OR (duc va)) nhanh thai cua tre.
• Adding a wildcard symbol may retrieve word variants: su hai ky dang xa hoi. hieu van cam ((duc van) or (duc va)) nhanh thai cua tre*.