Perhaps you should try some spelling variations:
hieu san » hieu van, hieu sau, chieu sang
van hanh » van thanh, ban hanh, van ban
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
van anh » van thanh, tuan anh, van minh
dat su » sat su
pham » phan

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 ky) OR (sach y)) nang xa hoi. hieu san pham duc ((van hanh) or (van anh)) dat su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) nang xa hoi. hieu san pham duc ((van hanh) OR (van anh)) dat su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sach y)) nang xa hoi. hieu san pham duc ((van hanh) or (van anh)) dat su triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sach y)) nang xa hoi. hieu san pham duc ((van hanh) or (van anh)) dat su triet*.