Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
hanh ca » hanh cac, hanh cat, hanh cua
qua cac » cua cac
y nang » ky nang, ly nang, v nang
toc va » hoc va, tuc va, loc va
toc ta » toc tay, toc thai
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 qua cac ((toc va) OR (toc ta)) hanh 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 qua cac ((toc va) OR (toc ta)) hanh 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 qua cac ((toc va) OR (toc ta)) hanh ca cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((me hoi) or (ma hoa)). hieu qua cac ((toc va) OR (toc ta)) hanh ca cua te*.