Perhaps you should try some spelling variations:
hanh cac » hang cac, hanh cat, nhanh cay
tu sach » thu sach, su sach, te sach
qua cac » cua cac
cac tac » cac toc, cac bac, cac dac
xa hanh » xa thanh, xa khanh, va hanh
cua tre » cuu tre, cua triet, dua tren
y nang » ky nang, ly nang, v nang
me hoi » le hoi
tac xa » tuc xa, tac da
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 qua cac tac xa hanh cac ((cua tre) or (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 qua cac tac xa hanh cac ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((me hoi) or (ma hoa)). hieu qua cac tac xa hanh cac ((cua tre) or (cua te))*.