Perhaps you should try some spelling variations:
dang tay » dang xay, dung tay, dan tay
cua tre » cua te, cuu tre, cua triet
cac loc » cac lop, cac toc, cac hoc
va dinh » van dinh, va kinh, va tinh
va hanh » van hanh, va thanh, va danh
hieu va » lieu va
tay hoi » tay ho, tao hoi, tay thai
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 tay hoi. ((hieu va) OR (hieu qua)) cac loc ((va hanh) or (va dinh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky dang tay hoi. ((hieu va) OR (hieu qua)) cac loc ((va hanh) OR (va dinh)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky dang tay hoi. ((hieu va) OR (hieu qua)) cac loc ((va hanh) or (va dinh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky dang tay hoi. ((hieu va) OR (hieu qua)) cac loc ((va hanh) or (va dinh)) vi cua tre*.