Perhaps you should try some spelling variations:
tang thanh » dang thanh, trung thanh, hoang thanh
cua triet » cua viet, su triet, va triet
thanh vai » thanh hai, thanh van, thanh tai
hieu van » hieu va, thien van, lieu va
cao tuc » dao tuc, cao duc, cao toc
vai cua » dai cua, hai cua, lai cua
cao suc » cao su, cao duc
tu sach » thu sach, su sach, tu cach
lo nang » ho nang, ly nang, loai nang
te sach » toc sach
x hoi » xa hoi, o hoi, x ho

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) or (te sach)) lo nang x hoi. hieu van ((cao tuc) OR (cao suc)) tang thanh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) lo nang x hoi. hieu van ((cao tuc) OR (cao suc)) tang thanh vai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) lo nang x hoi. hieu van ((cao tuc) OR (cao suc)) tang thanh vai cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) lo nang x hoi. hieu van ((cao tuc) OR (cao suc)) tang thanh vai cua triet*.