Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
lam quoc » lam duoc, nam quoc, lam thuoc
te sach » toc sach
van lam » van nam
bo benh » so benh, ba benh, co benh
cua tre » cua te, cuu tre, cua triet
y lang » o lang, tay lang, yen lang
_ lang » o lang, _ land
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 ((y lang) OR (_ 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 ((y lang) OR (_ 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 ((y lang) OR (_ 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 ((y lang) OR (_ lang)) xa hoi. hieu van lam quoc ((bo benh) or (o benh)) ve cua tre*.