Perhaps you should try some spelling variations:
thien van » thi van
va triet » va thiet, va trien, ve triet
thanh vi » hanh vi, thanh va, thanh ve
luc bat » suc bat, luc nhat, luat bat
luc ban » duc ban, cuc ban, luc van
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
van cau » van dau, van hau, van chat
ma hoi » xa hoi, ma hoa, me hoi
vi va » vi van, vai va, vu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang ((ma hoi) or (mai hoi)). thien van cau ((luc ban) OR (luc bat)) thanh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((ma hoi) OR (mai hoi)). thien van cau ((luc ban) OR (luc bat)) thanh vi va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((ma hoi) or (mai hoi)). thien van cau ((luc ban) OR (luc bat)) thanh vi va triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((ma hoi) or (mai hoi)). thien van cau ((luc ban) OR (luc bat)) thanh vi va triet*.