Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
sach tu » sach thu, cach tu, sach ty
nang ma » tang ma, sang ma, nang cao
sach vu » sach va, sach uu, sach xu
hieu va » lieu va, hieu qua
cac xuc » cac nuoc, chat xuc, cac cuoc
ma hoi » mai hoi, xa hoi, ma hoa
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: tu ((sach vu) or (sach tu)) nang ma hoi. hieu va ((cac xuc) OR (cam xuc)) van hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach vu) OR (sach tu)) nang ma hoi. hieu va ((cac xuc) OR (cam xuc)) van hanh vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach vu) or (sach tu)) nang ma hoi. hieu va ((cac xuc) OR (cam xuc)) van hanh vi su triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach vu) or (sach tu)) nang ma hoi. hieu va ((cac xuc) OR (cam xuc)) van hanh vi su triet*.