Perhaps you should try some spelling variations:
toan hanh » toan thanh, toan anh, tran hanh
hieu van » thien van, lieu va, hieu ve
duc toan » duc tan, duc ton, duc hoan
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
ky dang » ky nang, ky danh
dang ma » dang mau, dang mam, dang mat
cua tre » cuu tre, cua triet, dua tren
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky dang ma hoi. ((hieu van) or (hieu va)) cam duc toan hanh vi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky dang ma hoi. ((hieu van) OR (hieu va)) cam duc toan hanh vi ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: tu san ky dang ma hoi. ((hieu van) or (hieu va)) cam duc toan hanh vi ((cua tre) or (cua te))*.