Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
qua cac » cua cac
cac tuc » cac toc, cac tu, cac tac
tuc van » thuc van, truc van, tuc va
hanh ca » hanh cac, hanh cat, hanh cua
cua tre » cuu tre, cua triet, dua tren
y nang » ky nang, ly nang, v nang
me hoi » le hoi
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: te sach y nang ((me hoi) or (ma hoa)). hieu qua cac tuc van hanh ca ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((me hoi) OR (ma hoa)). hieu qua cac tuc van hanh ca ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ((me hoi) or (ma hoa)). hieu qua cac tuc van hanh ca ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((me hoi) or (ma hoa)). hieu qua cac tuc van hanh ca ((cua tre) OR (cua te))*.