Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
dung tri » dung tai, dung tren, dung sai
nang xa » nang x, lang xa, nang ma
lang ha » long ha
xuc van » duc van, vuc van, xuc ban
luc van » luoc van, luu van, duc van
cua tre » cua te, cuu tre, cua triet
su sai » su tai, su hai, su dai
sai ky » sac ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sai ky ((nang xa) or (lang ha)) hoi. hieu qua cham ((xuc van) OR (luc van)) dung tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky ((nang xa) OR (lang ha)) hoi. hieu qua cham ((xuc van) OR (luc van)) dung tri cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky ((nang xa) or (lang ha)) hoi. hieu qua cham ((xuc van) OR (luc van)) dung tri cua tre".
• Adding a wildcard symbol may retrieve word variants: su sai ky ((nang xa) or (lang ha)) hoi. hieu qua cham ((xuc van) OR (luc van)) dung tri cua tre*.