Perhaps you should try some spelling variations:
tao nano » tao nganh, cao nang, tao cao
va tinh » may tinh
hoc anh » hoc nganh, hoc nhanh, ngoc anh
nano xa » nano va, nano bac, nano cau
hieu va » lieu va, hieu qua
va dinh » van dinh, va kinh, vu dinh
cua te » cua tu
vi cua » vai cua, di cua
va cam » va cham, va cac, va cao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc cao) or (hoc anh)) tao nano xa hoi. hieu va cam xuc ((va dinh) OR (va tinh)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc cao) OR (hoc anh)) tao nano xa hoi. hieu va cam xuc ((va dinh) OR (va tinh)) vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc cao) or (hoc anh)) tao nano xa hoi. hieu va cam xuc ((va dinh) OR (va tinh)) vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((hoc cao) or (hoc anh)) tao nano xa hoi. hieu va cam xuc ((va dinh) OR (va tinh)) vi cua te*.