Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
phau benh » kham benh
nay quoc » nam quoc, nhap quoc, nhan quoc
cua tre » cua te, cuu tre, dua tren
benh vi » benh va, benh ve, benh li
te sach » toc sach
sach do » sach dao, sach doi, sach de
hieu va » lieu va, hieu qua
song xa » song cua
do song » doi song, do hong, do cong

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach do song xa hoi. hieu va ((nay quoc) or (nha nuoc)) phau benh vi ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach do song xa hoi. hieu va ((nay quoc) OR (nha nuoc)) phau benh vi ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach do song xa hoi. hieu va ((nay quoc) or (nha nuoc)) phau benh vi ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: te sach do song xa hoi. hieu va ((nay quoc) or (nha nuoc)) phau benh vi ((cua tre) OR (cua triet))*.