Perhaps you should try some spelling variations:
vu sach » vu bach, su sach, vu khach
cac tuc » cac toc, cac tu, cac tac
ty hang » ty xang, thi hang, thu hang
danh vi » hanh vi, dinh vi, danh di
ly hang » ly quang
hieu ve » hieu van
va danh » va dinh, va dan, va hanh
hieu va » lieu va, hieu qua
vi cua » vai cua, di cua
cua te » cua tu
tuc va » thuc va, truc va, tuc xa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ((ty hang) OR (ly hang)) xa hoi. ((hieu ve) or (hieu va)) cac tuc va danh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((ty hang) OR (ly hang)) xa hoi. ((hieu ve) OR (hieu va)) cac tuc va danh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((ty hang) OR (ly hang)) xa hoi. ((hieu ve) or (hieu va)) cac tuc va danh vi cua te".
• Adding a wildcard symbol may retrieve word variants: vu sach ((ty hang) OR (ly hang)) xa hoi. ((hieu ve) or (hieu va)) cac tuc va danh vi cua te*.