Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
thu sach » thuat sach, thuoc sach, thu hoach
vien cac » vien bach, vien dai, vien da
giao cua » gian cua, giau cua, giao duc
tu sach » su sach, te sach, tu cach
va hinh » va chinh, va kinh, va tinh
gia cua » gian cua, giau cua, gia cuc
y nang » ky nang, ly nang, v nang
dan va » doan va, dan ca, ban va
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) y nang x hoi. hieu vien cac dan va hinh ((giao cua) OR (gia cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang x hoi. hieu vien cac dan va hinh ((giao cua) OR (gia cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) y nang x hoi. hieu vien cac dan va hinh ((giao cua) OR (gia cua)) triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) y nang x hoi. hieu vien cac dan va hinh ((giao cua) OR (gia cua)) triet*.