Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
doc sach » hoc sach, toc sach, nuoc sach
ty ngang » ly ngan, te ngan, tu ngan
thanh vi » hanh vi, thanh va, thanh ve
khoa hoc » hoa hoc
hieu va » lieu va, hieu qua
vuc van » duc van, luc van, thuc van
cac vuc » cac nuoc, cac vung, cac cuoc
cua cau » cua cac, cua chu, cua cay
sach ty » sach y, sach tu, sach thu
hieu ve » hieu van
cho hoc » co hoc
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach ty ngang ((cho hoc) or (khoa hoc)). ((hieu ve) or (hieu va)) cac vuc van thanh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ty ngang ((cho hoc) OR (khoa hoc)). ((hieu ve) OR (hieu va)) cac vuc van thanh vi cua cau*.