Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
van tham » van thanh, van tuan, van chat
tham luc » than luc, tham nuoc, tham thuc
danh vi » hanh vi, dinh vi, danh va
cua tre » cua te, cuu tre, dua tren
danh di » danh du, xanh di, danh dien
nang ma » tang ma, sang ma, nang cao
can ky » van ky, dan ky, ban ky
luc va » duc va, tuc va, loc va
ma hoi » mai hoi, xa hoi, ma hoa
tu can » tu ban, tu cac, thu canh

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu can ky nang ma hoi. hieu van tham luc va ((danh vi) OR (danh di)) ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu can ky nang ma hoi. hieu van tham luc va ((danh vi) OR (danh di)) ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu can ky nang ma hoi. hieu van tham luc va ((danh vi) OR (danh di)) ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu can ky nang ma hoi. hieu van tham luc va ((danh vi) OR (danh di)) ((cua tre) or (cua triet))*.