Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
duc manh » suc manh, duc anh, duc minh
hanh ki » hanh vi, hanh ky, hanh kien
qua ban » cua ban, qua quan
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
duc van » duc va, duc tan, duc phan
sach v » sach va, sach y, sach 2
ve cac » va cac, vien cac
v nang » va nang, vu nang, van nang
ki su » ky 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 hoi. hieu ve cac ((((duc van) OR (duc manh))) OR (qua ban)) hanh ki su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach v nang xa hoi. hieu ve cac ((((duc van) OR (duc manh))) or (qua ban)) hanh ki su triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach v nang xa hoi. hieu ve cac ((((duc van) OR (duc manh))) or (qua ban)) hanh ki su triet*.