Perhaps you should try some spelling variations:
ve triet » va trien, su triet
hanh dao » lanh dao, thanh dat, thanh dam
thuc day » thuc dan, thuc vat
thuc va » thuc vat, thuc dan
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
ma hoi » mai hoi, xa hoi, ma hoa
dao ve » bao ve, dap ve, dau ve
tuc va » truc va, tuc xa, duc 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 sang ma hoi. hieu ve cham ((tuc va) or (((thuc va) OR (thuc day)))) hanh dao ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky sang ma hoi. hieu ve cham ((tuc va) OR (((thuc va) OR (thuc day)))) hanh dao ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky sang ma hoi. hieu ve cham ((tuc va) or (((thuc va) OR (thuc day)))) hanh dao ve triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky sang ma hoi. hieu ve cham ((tuc va) or (((thuc va) OR (thuc day)))) hanh dao ve triet*.