Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
cau luc » cau truc, cau phuc
danh vi » hanh vi, danh di, danh va
dinh vi » dinh ve, dinh viet, dinh tri
y lang » o lang, tay lang, yen lang
_ lang » o lang, _ land
va cau » van cau, va cac, va dau
luc va » duc va, tuc va, loc va
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 ((danh vi) OR (dinh 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 ((danh vi) OR (dinh 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 ((danh vi) OR (dinh vi)) cua te*".