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