Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
dinh tri » chinh tri
sach doi » sach hoi, sach moi, sach dao
va dinh » van dinh, va kinh, va tinh
cau luc » cau truc, cau phuc
vu sach » vu bach, su sach, vu khach
lang xa » lang ha, dang xay, lang van
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
tri su » tri du, tai su, trinh su

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach doi ((lang xa) or (nang ma)) hoi. hieu ve ((cau luc) or (cam xuc)) va dinh tri su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach doi ((lang xa) OR (nang ma)) hoi. hieu ve ((cau luc) OR (cam xuc)) va dinh tri su triet.
• Adding a wildcard symbol may retrieve word variants: vu sach doi ((lang xa) or (nang ma)) hoi. hieu ve ((cau luc) or (cam xuc)) va dinh tri su triet*.