Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
van hanh » van thanh, ban hanh, van anh
dang xay » dang van, van xay
chat xuc » chat huu, chao xu, chat cua
vu sach » vu bach, su sach, vu khach
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky ((nang xa) or (dang xay)) hoi. hieu ve ((cam xuc) or (chat xuc)) van hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky ((nang xa) OR (dang xay)) hoi. hieu ve ((cam xuc) OR (chat xuc)) van hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sach ky ((nang xa) or (dang xay)) hoi. hieu ve ((cam xuc) or (chat xuc)) van hanh dai cua tre*.