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