Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cham hoc » cham soc, chat hoc, cham hoi
thanh vi » hanh vi, thanh va, thanh ve
sach thu » sach thue, sach thieu, sach tham
dieu vu » dien vu, dieu va, dieu cua
sach ty » sach y, sach tu, xach tay
hoc van » hoc dan, hoc va, hoc vat
hieu va » lieu va, hieu qua
vi cua » vai cua, di cua
cua te » cua tu
ang xa » lang xa, mang xa, dang xay

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 ty) or (sach thu)) ang xa hoi. ((dieu vu) or (hieu va)) cham hoc van thanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach thu)) ang xa hoi. ((dieu vu) OR (hieu va)) cham hoc van thanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach thu)) ang xa hoi. ((dieu vu) or (hieu va)) cham hoc van thanh vi cua te*.