Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
dung doi » huong doi, dung tai, dung co
cua viet » ca viet, hoa viet, cua vat
so sach » so sanh, bo sach
co sach » bo sach, cuon sach
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
xa dung » xay dung, xa dong, va dung
doi cua » dai cua, hoi cua
va cam » va cham, va cac, va cao
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: ((so sach) or (((co sach) OR (hoc sach)))) ky nang x hoi. hieu va cam tuc xa dung doi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (((co sach) OR (hoc sach)))) ky nang x hoi. hieu va cam tuc xa dung doi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (((co sach) OR (hoc sach)))) ky nang x hoi. hieu va cam tuc xa dung doi cua viet".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (((co sach) OR (hoc sach)))) ky nang x hoi. hieu va cam tuc xa dung doi cua viet*.