Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
ve chat » va chat, van chat
xuc van » duc van, luc van, vuc van
vu chat » va chat, du chat, vu cham
dai hoi » dai hoc, dai hai, dai moi
ky tang » ky dang, kho tang, ky trong
vi cua » vai cua, di cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ky tang) or (ky nang)) dai hoi. hieu ((vu chat) OR (ve chat)) xuc van hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky tang) OR (ky nang)) dai hoi. hieu ((vu chat) OR (ve chat)) xuc van hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky tang) or (ky nang)) dai hoi. hieu ((vu chat) OR (ve chat)) xuc van hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky tang) or (ky nang)) dai hoi. hieu ((vu chat) OR (ve chat)) xuc van hanh vi cua te*.