Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
dinh ca » dinh cac, dinh cua, dinh cao
xa dinh » xac dinh, va dinh, ba dinh
cac tac » cac toc, cac bac, cac dac
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac nuoc
y nang » ky nang, ly nang, v nang
me hoi » le hoi
ca cua » co cua
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: tu sach y nang ((me hoi) or (ma hoa)). hieu va ((cac tuc) OR (cac tac)) xa dinh ca cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((me hoi) OR (ma hoa)). hieu va ((cac tuc) OR (cac tac)) xa dinh ca cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ((me hoi) or (ma hoa)). hieu va ((cac tuc) OR (cac tac)) xa dinh ca cua te*".