Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hang vi » hang va, hanh vi, khang voi
hang di » hang doi, hang dien, hang dich
tuc van » thuc van, truc van, tuc va
co sach » bo sach, cuon sach, hoc sach
hieu va » lieu va, hieu qua
ly nang » ky nang, ly hang, ly vang
cac tuc » cac toc, cac tu, cac tac
y nang » ky nang, v nang, may nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: co sach ((y nang) OR (ly nang)) xa hoi. hieu va cac tuc van ((hang di) or (hang vi)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach ((y nang) OR (ly nang)) xa hoi. hieu va cac tuc van ((hang di) OR (hang vi)) cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ((y nang) OR (ly nang)) xa hoi. hieu va cac tuc van ((hang di) or (hang vi)) cua triet*".