Perhaps you should try some spelling variations:
lam quoc » lam duoc, nam quoc, lam thuoc
lan benh » san benh, can benh, doan benh
tay lang » tai lang, tay tang, tay quang
quoc lan » quoc ban, nuoc luan, quoc quan
hieu van » hieu va, thien van, lieu va
te sach » toc sach
van lam » van nam
y lang » o lang, _ lang, yen lang
ve cua » le cua, te cua, ve cum
de cua » le cua, te cua, dieu 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 (tay lang)) xa hoi. hieu van lam quoc lan benh ((ve cua) OR (de cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y lang) OR (tay lang)) xa hoi. hieu van lam quoc lan benh ((ve cua) OR (de cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y lang) or (tay lang)) xa hoi. hieu van lam quoc lan benh ((ve cua) OR (de cua)) triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((y lang) or (tay lang)) xa hoi. hieu van lam quoc lan benh ((ve cua) OR (de cua)) triet*.