Perhaps you should try some spelling variations:
cam quoc » cac quoc, cao quoc, nam quoc
san benh » sau benh, tai benh, gay benh
te sach » toc sach
lang ha » long ha
hieu va » lieu va, hieu qua
cua tre » cuu tre, cua triet, dua tren
y lang » o lang, _ lang, tay lang
ha hoi » hoa hoi, ha noi, xa hoi
va cam » va cham, va cac, va cao
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: te sach y lang ha hoi. hieu va cam quoc ((san benh) or (so benh)) vi ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y lang ha hoi. hieu va cam quoc ((san benh) OR (so benh)) vi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y lang ha hoi. hieu va cam quoc ((san benh) or (so benh)) vi ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: te sach y lang ha hoi. hieu va cam quoc ((san benh) or (so benh)) vi ((cua tre) OR (cua te))*.