Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
duc van » duc va, duc manh, duc phan
sach v » sach va, sach y, sach 2
ve cam » ve cham, ve cac, va cam
vi su » va su, ve su, ki su

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: tu sach v ((nang xa) OR (nang ma)) hoi. hieu ve cam ((duc van) OR (duc tan)) hanh vi su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach v ((nang xa) OR (nang ma)) hoi. hieu ve cam ((duc van) or (duc tan)) hanh vi su triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach v ((nang xa) OR (nang ma)) hoi. hieu ve cam ((duc van) or (duc tan)) hanh vi su triet*.