Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
day thanh » dao thanh, dat thanh, da thanh
vien cac » vien bach, vien dai, vien da
toc sach » hoc sach, doc sach, thuoc sach
thuc day » thuc dan, thuc vat
cac thuc » cach thuc, cac thu, can thuc
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
ve cua » de cua, te cua, ve cum
le cua » ly cua

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 (toc sach)) ky lang xa hoi. hieu vien cac thuc day thanh ((ve cua) OR (le cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) ky lang xa hoi. hieu vien cac thuc day thanh ((ve cua) OR (le cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (toc sach)) ky lang xa hoi. hieu vien cac thuc day thanh ((ve cua) OR (le cua)) te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) ky lang xa hoi. hieu vien cac thuc day thanh ((ve cua) OR (le cua)) te*.