Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
danh vi » hanh vi, dinh vi, danh di
hieu va » lieu va, hieu qua
va cau » van cau, va cac, va dau
y lang » o lang, tay lang, yen lang
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
_ lang » o lang, _ land
vi cua » vai cua, di cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((y lang) or (_ lang)) xa hoi. hieu va cau ((luc va) OR (tuc va)) danh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y lang) OR (_ lang)) xa hoi. hieu va cau ((luc va) OR (tuc va)) danh vi cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y lang) or (_ lang)) xa hoi. hieu va cau ((luc va) OR (tuc va)) danh vi cua te*".