Perhaps you should try some spelling variations:
thien van » thi van
cau thuc » cau truc, cuu thuc, can thuc
nang ma » tang ma, sang ma, nang cao
co sach » bo sach, cuon sach, hoc sach
van cau » van dau, van hau, van chat
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
su sach » so sach, vu sach
ma hoi » mai hoi, xa hoi, ma hoa
vai va » mai va, dai va, hai va
vi va » vi van, vu va, bi 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) or (co sach)) ky nang ma hoi. thien van cau thuc va danh ((vi va) OR (vai va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (co sach)) ky nang ma hoi. thien van cau thuc va danh ((vi va) OR (vai va)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (co sach)) ky nang ma hoi. thien van cau thuc va danh ((vi va) OR (vai va)) triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (co sach)) ky nang ma hoi. thien van cau thuc va danh ((vi va) OR (vai va)) triet*.