Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
hieu ve » hieu van
dai hoi » dai hoc, dai hai, dai moi
ky dang » ky nang, ky danh
ky tang » ky nang, kho tang, ky trong
xuc va » duc va, tuc va, luc va
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 dang)) dai hoi. ((hieu ve) or (hieu va)) cam xuc va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky tang) OR (ky dang)) dai hoi. ((hieu ve) OR (hieu va)) cam xuc va hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky tang) or (ky dang)) dai hoi. ((hieu ve) or (hieu va)) cam xuc va hanh vi cua te*.