Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, dai khoa
cac khoi » cac thoi, cac khoan, cach thoi
hanh tai » thanh tai, hang tai, hinh tai
cuu tre » cua tre, cau tren, cau treo
han tai » hang tai, nhan tai, van tai
hieu ve » hieu va, hieu van
xuc van » duc van, luc van, vuc van
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, va cam

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 ky nang ((mai khoi) or (cac khoi)). hieu ve cam xuc van ((hanh tai) OR (han tai)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang ((mai khoi) OR (cac khoi)). hieu ve cam xuc van ((hanh tai) OR (han tai)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang ((mai khoi) or (cac khoi)). hieu ve cam xuc van ((hanh tai) OR (han tai)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sac ky nang ((mai khoi) or (cac khoi)). hieu ve cam xuc van ((hanh tai) OR (han tai)) cuu tre*.