Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
duc van » duc va, duc tan, duc manh
hanh ve » hanh vi, hanh va, hanh kem
qua ban » cua ban, qua quan
duc ban » duc tan, dua ban, duc man
hieu ve » hieu va, hieu van
su tien » su kien, su hien, tu tieng
sach v » sach va, sach y, sach 2
ve cac » va cac, vien cac
v nang » va nang, vu nang, van nang
x hoi » xa hoi, o hoi, x ho
ve su » va su

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 v nang x hoi. hieu ve cac ((((duc ban) OR (duc van))) or (qua ban)) hanh ve su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v nang x hoi. hieu ve cac ((((duc ban) OR (duc van))) OR (qua ban)) hanh ve su tien*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach v nang x hoi. hieu ve cac ((((duc ban) OR (duc van))) or (qua ban)) hanh ve su tien*".