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