Perhaps you should try some spelling variations:
lap hoat » tap hoa, dan hoat, lap dat
so sach » so sanh, bo sach, co sach
danh vi » hanh vi, dinh vi, danh di
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ky dang » ky nang, ky danh
lap hai » lap tai, lap lai, lanh hai
ve cam » ve cham, ve cac, va cam
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: so sach ky dang ((lap hai) OR (lap hoat)). hieu ve cam ((duc va) or (tuc xa)) danh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky dang ((lap hai) OR (lap hoat)). hieu ve cam ((duc va) OR (tuc xa)) danh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky dang ((lap hai) OR (lap hoat)). hieu ve cam ((duc va) or (tuc xa)) danh vi cua te".
• Adding a wildcard symbol may retrieve word variants: so sach ky dang ((lap hai) OR (lap hoat)). hieu ve cam ((duc va) or (tuc xa)) danh vi cua te*.