Perhaps you should try some spelling variations:
hieu viet » sieu viet, hieu viec, lieu viet
viet tech » viet sach
van hanh » van thanh, ban hanh, van anh
luoc van » luoc can, luoc va, luc van
mai hoi » mai khoi, lai hoi, mai doi
dai hoi » dai hoc, dai hai, dai moi
tu bai » tu ban, te bai
vi cua » vai cua, di cua
cua te » cua tu
tu bat » tu ban, tu dat

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu bai) or (tu bat)) ky nang ((mai hoi) or (dai hoi)). hieu viet tech luoc van hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu bai) OR (tu bat)) ky nang ((mai hoi) OR (dai hoi)). hieu viet tech luoc van hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: ((tu bai) or (tu bat)) ky nang ((mai hoi) or (dai hoi)). hieu viet tech luoc van hanh vi cua te*.