Perhaps you should try some spelling variations:
dich hoc » sinh hoc, hinh hoc, tinh hoc
hieu va » lieu va, hieu qua
va dich » van dich
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
vi cua » vai cua, di cua
tu sac » tu sach, tu cac, tu san
tay ho » tay co, tay o, tay khao
ly anh » le anh
ky anh » ky danh, ty anh
cua te » cua tu

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 (ly anh)) tay ho. hieu va dich hoc ((va hanh) or (va danh)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ((ky anh) OR (ly anh)) tay ho. hieu va dich hoc ((va hanh) OR (va danh)) vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ((ky anh) OR (ly anh)) tay ho. hieu va dich hoc ((va hanh) or (va danh)) vi cua te".
• Adding a wildcard symbol may retrieve word variants: tu sac ((ky anh) OR (ly anh)) tay ho. hieu va dich hoc ((va hanh) or (va danh)) vi cua te*.