Perhaps you should try some spelling variations:
thien van » thi van
va triet » va thiet, va trien, ve triet
thuc dan » thuc hanh, hoc dan, thuc vat
nang ma » tang ma, sang ma, nang cao
van cau » van dau, van hau, van chat
thuc va » thuc vat, thuc day
co sach » bo sach, cuon sach, hoc sach
danh vi » hanh vi, dinh vi, danh di
su sach » so sach, vu sach
ma hoi » mai hoi, xa hoi, ma hoa
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) or (co sach)) ky nang ma hoi. thien van cau ((thuc va) OR (thuc dan)) danh vi 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) OR (thuc dan)) danh vi 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) OR (thuc dan)) danh vi va triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (co sach)) ky nang ma hoi. thien van cau ((thuc va) OR (thuc dan)) danh vi va triet*.