Perhaps you should try some spelling variations:
su sach » so sach, vu sach
danh vi » hanh vi, dinh vi, danh di
truc va » thuc va, thuc vat, trung va
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ky sang » ky nang, ky dang, ky tang
xa hai » xa thai, xua hai, xa hoi
ve cac » va cac, vien cac
ma hai » ta hai, va hai, manh hai
vi cua » vai cua, di cua
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky sang ((ma hai) OR (xa hai)). hieu ve cac ((truc va) OR (duc va)) danh vi cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky sang ((ma hai) OR (xa hai)). hieu ve cac ((truc va) or (duc va)) danh vi cua te~".
• Adding a wildcard symbol may retrieve word variants: su sach ky sang ((ma hai) OR (xa hai)). hieu ve cac ((truc va) or (duc va)) danh vi cua te*.