Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
duc manh » suc manh, duc anh, duc minh
hanh dai » hanh tai, hanh dao, vanh dai
dua tren » dung tren
hieu ve » hieu va, hieu van
duc van » duc va, duc tan, duc phan
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
ve cao » va cao, ve bao, ve cac
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach v nang x hoi. hieu ve cao ((duc van) OR (duc manh)) hanh dai ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach v nang x hoi. hieu ve cao ((duc van) OR (duc manh)) hanh dai ((dua tren) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach v nang x hoi. hieu ve cao ((duc van) OR (duc manh)) hanh dai ((dua tren) or (cua te))*".