Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh vi » hanh vi, thanh va, thanh ve
nhan luc » nang luc
than luc » than duc, thanh luu, thuy luc
su triet » su viet, su tien, ve triet
lang xa » lang ha, dang xay, lang van
sach ky » sac ky, sach ty, sach kem
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: thu ((sach ky) OR (sach y)) lang xa hoi. hieu qua ((than luc) or (nhan luc)) van thanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach y)) lang xa hoi. hieu qua ((than luc) OR (nhan luc)) van thanh vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) OR (sach y)) lang xa hoi. hieu qua ((than luc) or (nhan luc)) van thanh vi su triet".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) OR (sach y)) lang xa hoi. hieu qua ((than luc) or (nhan luc)) van thanh vi su triet*.