Perhaps you should try some spelling variations:
lam quoc » lam duoc, nam quoc, lam thuoc
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
bo benh » so benh, ba benh, co benh
van lam » van nam
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet
y lang » o lang, _ lang, tay lang
o benh » so benh, hoc benh, soc benh
ve cua » le cua, de cua, te cua

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) OR (toc sach)) y lang xa hoi. hieu van lam quoc ((bo benh) or (o benh)) ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) y lang xa hoi. hieu van lam quoc ((bo benh) OR (o benh)) ve cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) y lang xa hoi. hieu van lam quoc ((bo benh) or (o benh)) ve cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) y lang xa hoi. hieu van lam quoc ((bo benh) or (o benh)) ve cua tre*.