Perhaps you should try some spelling variations:
dang xay » dang van, van xay
cua tre » cua te, cuu tre, cua triet
va danh » va dan, dia danh, va thanh
va dinh » van dinh, va kinh, va tinh
va hanh » van hanh, va thanh, ban hanh
cac loc » cac lop, cac toc, cac hoc
hieu va » lieu va, hieu qua
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
sac ky » cac ky, sai ky
vi cua » vai cua, di cua
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky dang xay hoi. hieu va cac loc ((va hanh) or (((va danh) OR (va dinh)))) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky dang xay hoi. hieu va cac loc ((va hanh) OR (((va danh) OR (va dinh)))) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky dang xay hoi. hieu va cac loc ((va hanh) or (((va danh) OR (va dinh)))) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky dang xay hoi. hieu va cac loc ((va hanh) or (((va danh) OR (va dinh)))) vi cua tre*.