Perhaps you should try some spelling variations:
sach thuat » sach tham, dich thuat, cac thuat
thuat mang » thuat bang, thuat nang, thuat trang
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
so sach » so sanh, bo sach, co sach
va hanh » van hanh, va thanh, ban hanh
doi cua » dai cua, hoi cua
va danh » va dinh, va dan, dia danh
mang xa » lang xa, mang may, dang xay
cac tu » cac thu, cach tu, cac du
di cua » dai cua, de cua, do cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach thuat mang xa hoi. hieu vien cac tu ((va danh) or (va hanh)) ((di cua) or (doi cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thuat mang xa hoi. hieu vien cac tu ((va danh) OR (va hanh)) ((di cua) OR (doi cua)) te.
• Adding a wildcard symbol may retrieve word variants: so sach thuat mang xa hoi. hieu vien cac tu ((va danh) or (va hanh)) ((di cua) or (doi cua)) te*.