Perhaps you should try some spelling variations:
dung tren » dung trong, dung trung
duc manh » suc manh, duc anh, duc tan
duc minh » duc anh
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
y nang » ky nang, ly nang, v nang
ve cao » va cao, ve bao, ve cac
cua te » cua tu

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 y nang xa hoi. hieu ve cao ((duc manh) OR (duc minh)) hanh tai ((dung tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. hieu ve cao ((duc manh) OR (duc minh)) hanh tai ((dung tren) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. hieu ve cao ((duc manh) OR (duc minh)) hanh tai ((dung tren) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu ve cao ((duc manh) OR (duc minh)) hanh tai ((dung tren) or (cua te))*.