Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, dai khoa
hang tai » hang va, dung tai
hanh tai » thanh tai, han tai, hinh tai
cac khoi » cac thoi, cac khoan, cach thoi
buu tre » cuu tre
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc va
sac ky » cac ky, sai ky
su sac » su sach, 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 ky nang ((mai khoi) or (cac khoi)). hieu ve cam xuc va ((hanh tai) OR (hang tai)) buu 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 va ((hanh tai) OR (hang tai)) buu 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 va ((hanh tai) OR (hang tai)) buu tre".
• Adding a wildcard symbol may retrieve word variants: su sac ky nang ((mai khoi) or (cac khoi)). hieu ve cam xuc va ((hanh tai) OR (hang tai)) buu tre*.