Perhaps you should try some spelling variations:
dung tri » dung tai, dung tren, dung sai
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
qua cam » qua cham, qua cac, qua ca
xuc van » duc van, luc van, xuc ban
vuc van » duc van, luc van, thuc 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 xa)) hoi. hieu qua cam ((xuc van) OR (vuc 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 xa)) hoi. hieu qua cam ((xuc van) OR (vuc 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 xa)) hoi. hieu qua cam ((xuc van) OR (vuc van)) dung tri cua tre".
• Adding a wildcard symbol may retrieve word variants: su sai ky ((nang xa) or (lang xa)) hoi. hieu qua cam ((xuc van) OR (vuc van)) dung tri cua tre*.