Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
danh di » danh du, xanh di, danh dien
danh vi » hanh vi, dinh vi, danh va
hieu va » lieu va, hieu qua
cau loc » hau loc, cau hoc, cau luc
cua tre » cua te, cuu tre, cua triet
va cau » van cau, va cac, va dau
y lang » o lang, _ lang, tay lang
loc va » hoc va, luc va
ha hoi » hoa hoi, ha noi, va hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y lang ((ha hoi) or (xa hoi)). hieu va cau loc va ((danh vi) or (danh di)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y lang ((ha hoi) OR (xa hoi)). hieu va cau loc va ((danh vi) OR (danh di)) cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach y lang ((ha hoi) or (xa hoi)). hieu va cau loc va ((danh vi) or (danh di)) cua tre*.