Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hieu vien » hieu viec, thieu nien, hieu tieng
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
cac tuc » cac toc, cac tac, cac nuoc
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
cac tu » cac thu, cach tu, cac du
di cua » dai cua, doi cua, de cua

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 ky nang xa hoi. ((hieu vien) or (hieu hien)) ((cac tuc) or (cac tu)) va hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. ((hieu vien) OR (hieu hien)) ((cac tuc) OR (cac tu)) va hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. ((hieu vien) or (hieu hien)) ((cac tuc) or (cac tu)) va hanh di cua tre*.