Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
su sach » vu sach
so sach » so sanh, bo sach, co sach
ly nang » ky nang, ly hang, ly vang
nang ma » tang ma, sang ma, nang cao
thuc va » thuc vat, thuc dan, thuc day
hanh va » hang va, hanh vi
ma hoi » mai hoi, xa hoi, ma hoa

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) OR (so sach)) ly nang ma hoi. lieu va cac ((duc va) or (thuc va)) hanh va su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ly nang ma hoi. lieu va cac ((duc va) OR (thuc va)) hanh va su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ly nang ma hoi. lieu va cac ((duc va) or (thuc va)) hanh va su triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ly nang ma hoi. lieu va cac ((duc va) or (thuc va)) hanh va su triet*.