Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
tang dai » tang tai, tang dan, lang dai
vu chat » va chat, ve chat, du chat
tu sach » thu sach, su sach, te sach
hieu vu » hieu va, hieu ve, hieu su
dai hoi » dai hoc, dai hai, dai moi
ky tang » ky nang, ky dang, kho tang
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc 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) or (tu cac)) ky tang dai hoi. hieu vu chat ((xuc va) OR (luc va)) thanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (tu cac)) ky tang dai hoi. hieu vu chat ((xuc va) OR (luc va)) thanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (tu cac)) ky tang dai hoi. hieu vu chat ((xuc va) OR (luc va)) thanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (tu cac)) ky tang dai hoi. hieu vu chat ((xuc va) OR (luc va)) thanh vi cua te*.