Perhaps you should try some spelling variations:
su sach » so sach, vu sach
danh vi » hanh vi, dinh vi, danh di
lap hai » lap tai, lap lai, lap hoat
hieu va » lieu va, hieu qua
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, xac va
y tang » ky tang, 6 tang, 5 tang
7 tang » 6 tang
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: su sach ((y tang) OR (7 tang)) lap hai. hieu va cam ((xuc va) or (luc va)) danh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y tang) OR (7 tang)) lap hai. hieu va cam ((xuc va) OR (luc va)) danh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y tang) OR (7 tang)) lap hai. hieu va cam ((xuc va) or (luc va)) danh vi cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ((y tang) OR (7 tang)) lap hai. hieu va cam ((xuc va) or (luc va)) danh vi cua te*.