Perhaps you should try some spelling variations:
thuc van » thuc vat, thuc dan, thuc va
dang xay » dang van, van xay
hieu ve » hieu va, hieu van
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
tu bach » vu bach, tu cach, tu hach
ve cam » ve cham, ve cac, va cam
vi cua » vai cua, di cua
tu bac » tu ban, tu cac, tu bat

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

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