Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
sach thu » sach thue, sach thieu, sach tham
phan duc » pham duc, phan tu, phan dau
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
hieu ke » hieu kem, chieu ke, hieu ky
nang xa » nang x, lang xa, nang ma
ke phan » ve phan, kenh phan, ke thang
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 thu) or (sach y)) nang xa hoi. hieu ke phan duc ((va hanh) OR (va danh)) ve su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thu) OR (sach y)) nang xa hoi. hieu ke phan duc ((va hanh) OR (va danh)) ve su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thu) or (sach y)) nang xa hoi. hieu ke phan duc ((va hanh) OR (va danh)) ve su triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach thu) or (sach y)) nang xa hoi. hieu ke phan duc ((va hanh) OR (va danh)) ve su triet*.