Perhaps you should try some spelling variations:
van thanh » van tuan
ban thanh » ban hanh, ban hang
cua triet » cua viet, su triet, va triet
nam thuc » nam thuoc, am thuc, nam thu
su sach » so sach, vu sach
hiem he » hiem xe, hieu he, thien he
y nang » ly nang, v nang, may nang
he nam » ha nam, nghe nam
le cua » ly cua

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 ((y nang) or (ky nang)) xa hoi. hiem he nam thuc ((van thanh) OR (ban thanh)) le cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (ky nang)) xa hoi. hiem he nam thuc ((van thanh) OR (ban thanh)) le cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) or (ky nang)) xa hoi. hiem he nam thuc ((van thanh) OR (ban thanh)) le cua triet*".