Perhaps you should try some spelling variations:
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cua tre » cuu tre, cua triet, dua tren
ve cac » va cac, vien cac
cac tu » cac thu, cach tu, cac du
dan vi » doan vi, dan va, gan vi
cua te » cua tu
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: te sach ky nang x hoi. hieu ve cac tu va ((dan vi) or (don vi)) ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang x hoi. hieu ve cac tu va ((dan vi) OR (don vi)) ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang x hoi. hieu ve cac tu va ((dan vi) or (don vi)) ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x hoi. hieu ve cac tu va ((dan vi) or (don vi)) ((cua tre) OR (cua te))*.