Perhaps you should try some spelling variations:
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
thanh va » thanh van, hanh va, thanh ha
thanh vi » hanh vi, thanh ve, nhanh vi
hieu van » hieu va, thien van, lieu va
te sach » toc sach
van cac » van hac, van cau, van bac
ty hang » ly hang, ty xang, thi hang
y hang » ly hang, yu hang, _ hang
cua su » qua su

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 hang) or (ty hang)) xa hoi. hieu van cac nuoc va ((thanh vi) OR (thanh va)) cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y hang) OR (ty hang)) xa hoi. hieu van cac nuoc va ((thanh vi) OR (thanh va)) cua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y hang) or (ty hang)) xa hoi. hieu van cac nuoc va ((thanh vi) OR (thanh va)) cua su".
• Adding a wildcard symbol may retrieve word variants: te sach ((y hang) or (ty hang)) xa hoi. hieu van cac nuoc va ((thanh vi) OR (thanh va)) cua su*.