Perhaps you should try some spelling variations:
thien van » thi van
thuc dant » thuoc dang, thuc hanh, thuc vat
thuc dan » thuc hanh, hoc dan, thuc vat
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
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: tu cac ky nang ma hoi. thien van nam ((thuc dan) or (thuc dant)) hanh vi ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky nang ma hoi. thien van nam ((thuc dan) OR (thuc dant)) hanh vi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky nang ma hoi. thien van nam ((thuc dan) or (thuc dant)) hanh vi ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu cac ky nang ma hoi. thien van nam ((thuc dan) or (thuc dant)) hanh vi ((cua tre) OR (cuu tre))*.