Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
su triet » su viet, su tien, ve triet
thanh vi » hanh vi, thanh va, thanh ve
sach ty » sach y, sach tu, sach thu
cam luc » cau luc
co sach » bo sach, cuon sach, hoc sach
hieu va » lieu va
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
vi su » va su, ve su, ki su

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 ty nang xa hoi. ((hieu va) or (hieu qua)) ((cam luc) OR (cam xuc)) van thanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach ty nang xa hoi. ((hieu va) OR (hieu qua)) ((cam luc) OR (cam xuc)) van thanh vi su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ty nang xa hoi. ((hieu va) or (hieu qua)) ((cam luc) OR (cam xuc)) van thanh vi su triet*".