Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
thanh loi » thanh hoa, thanh hai, thanh lap
vien cac » vien bach, vien dai, vien da
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
ty nang » ty xang, ty hang, ly nang
doc loi » duc loi
cua tre » cuu tre, cua triet, dua tren
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: su sach ((ty nang) OR (ky nang)) doc loi. hieu vien cac nuoc va thanh loi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty nang) OR (ky nang)) doc loi. hieu vien cac nuoc va thanh loi ((cua tre) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty nang) OR (ky nang)) doc loi. hieu vien cac nuoc va thanh loi ((cua tre) or (cua te))*".