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

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 hanh vi cua tu~.
• 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 hanh vi cua tu.
• 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 hanh vi cua tu*.