Perhaps you should try some spelling variations:
hoc thieu » toc thieu, hoc hien
sach hoa » sach ha, sach hoi, bach hoa
nghe cua » nghiep cua, nghe va, nghe che
so sach » so sanh, bo sach, co sach
nhi cua » nghi cua, chi cua, khi cua
bo don » ba don, bo doi, bo hon
co don » co dong, co dan, co dot

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 hoa hoc thieu ((nhi cua) or (nghe cua)) ets : nhung ((bo don) OR (co don)) vi đai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach hoa hoc thieu ((nhi cua) OR (nghe cua)) ets : nhung ((bo don) OR (co don)) vi đai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach hoa hoc thieu ((nhi cua) or (nghe cua)) ets : nhung ((bo don) OR (co don)) vi đai".
• Adding a wildcard symbol may retrieve word variants: so sach hoa hoc thieu ((nhi cua) or (nghe cua)) ets : nhung ((bo don) OR (co don)) vi đai*.