Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
dua tren » dung tren
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cao duc » cao suc, giao duc, tao duoc
dao duc » giao duc, tao duoc
va hanh » van hanh, va thanh, va danh
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: su sach ky nang x hoi. hieu ve ((cao duc) OR (dao duc)) va hanh tai ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. hieu ve ((cao duc) OR (dao duc)) va hanh tai ((dua tren) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu ve ((cao duc) OR (dao duc)) va hanh tai ((dua tren) or (cua te))*".