Perhaps you should try some spelling variations:
duc manh » suc manh, duc anh, duc minh
anh nghe » lang nghe, nang nghe, van nghe
ve triet » va trien, su triet
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
ty hang » ly hang, ty xang, thi hang
hang xa » hoang xa, hang va, hang ca
hieu va » lieu va
anh gi » anh ghi, danh gia, anh giao

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty hang xa hoi. ((hieu va) or (hieu qua)) pham duc manh ((anh gi) or (anh nghe)) ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty hang xa hoi. ((hieu va) OR (hieu qua)) pham duc manh ((anh gi) OR (anh nghe)) ve triet.
• Adding a wildcard symbol may retrieve word variants: so sach ty hang xa hoi. ((hieu va) or (hieu qua)) pham duc manh ((anh gi) or (anh nghe)) ve triet*.