Perhaps you should try some spelling variations:
vu sach » vu bach, vu khach
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
cac tac » cac toc, cac bac, cac dac
cac tuc » cac toc, cac tu, cac nuoc
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
su sach » so sach
ha hoi » hoa hoi, ha noi, xa hoi
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: ((vu sach) or (su sach)) ky lang ha hoi. hieu ve ((cac tuc) or (cac tac)) va hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) ky lang ha hoi. hieu ve ((cac tuc) OR (cac tac)) va hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (su sach)) ky lang ha hoi. hieu ve ((cac tuc) or (cac tac)) va hanh di cua tre*.