Perhaps you should try some spelling variations:
sang mai » sang ma, sang tai, lang mai
danh vi » hanh vi, dinh vi, danh di
vu cham » va cham, vu kham, tu cham
sach lo » sach dao, sach doi, sach hoi
hieu vu » hieu va, hieu ve, hieu su
mai hoi » mai khoi, dai hoi, lai hoi
soc va » loc va, doc va, goc 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 lo) or (sach y)) sang mai hoi. hieu vu cham ((soc va) OR (hoc va)) danh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach lo) OR (sach y)) sang mai hoi. hieu vu cham ((soc va) OR (hoc va)) danh vi cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach lo) or (sach y)) sang mai hoi. hieu vu cham ((soc va) OR (hoc va)) danh vi cua te*".