Perhaps you should try some spelling variations:
dich hoc » sinh hoc, hinh hoc, tinh hoc
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
va dich » van dich
hieu va » lieu va, hieu qua
tay hoi » tay ho, tao hoi, tay thai
anh tay » canh tay, anh ta, anh hay
sac ky » cac ky, sai ky
ky anh » ky danh, ly anh, ty anh
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 tay hoi. hieu va dich hoc ((va hanh) or (va danh)) vi ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky anh tay hoi. hieu va dich hoc ((va hanh) OR (va danh)) vi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky anh tay hoi. hieu va dich hoc ((va hanh) or (va danh)) vi ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky anh tay hoi. hieu va dich hoc ((va hanh) or (va danh)) vi ((cua tre) OR (cuu tre))*.