Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac
tao nano » tao nganh, cao nang, tao cao
hoc anh » hoc nganh, hoc nhanh, ngoc anh
nano xa » nano va, nano bac, nano cau
dinh vi » dinh ve, dinh viet, dinh tri
va dinh » van dinh, va kinh, va tinh
xuc va » duc va, tuc va, luc va
vi cua » vai cua, di cua
ve cam » ve cham, ve cac, ve cai
va cam » va cham, va cac, va cao
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: ((hoc sach) or (hoc anh)) tao nano xa hoi. hieu ((ve cam) OR (va cam)) xuc va dinh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (hoc anh)) tao nano xa hoi. hieu ((ve cam) OR (va cam)) xuc va dinh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) or (hoc anh)) tao nano xa hoi. hieu ((ve cam) OR (va cam)) xuc va dinh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (hoc anh)) tao nano xa hoi. hieu ((ve cam) OR (va cam)) xuc va dinh vi cua te*.