Perhaps you should try some spelling variations:
cac khoi » cac thoi, cac khoan, cach thoi
mai khoi » mai khoa, tai khoa, dai khoa
tai cua » thai cua, tai cuc, tri cua
han tai » hang tai, nhan tai, van tai
van han » van hanh, van phan, van nhan
duc van » duc va, duc tan, duc manh
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
su sach » so sach, vu sach
ve cam » ve cham, ve cac, va cam
su sac » su cac, su xac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sac) or (su sach)) ky nang ((mai khoi) or (cac khoi)). hieu ve cam duc van han tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su sach)) ky nang ((mai khoi) OR (cac khoi)). hieu ve cam duc van han tai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sac) or (su sach)) ky nang ((mai khoi) or (cac khoi)). hieu ve cam duc van han tai cua tre*.