Perhaps you should try some spelling variations:
tu ngang » tu ngan, hu angang, vu ngan
ban hanh » ban hang
cac cuoc » cac nuoc, ca cuoc, cac quoc
te sach » toc sach
cac vuc » cac nuoc, cac vung, cac quoc
cua cau » cua cac, cua chu, cua cay
sach tu » sach thu, cach tu, sach ty
hieu ve » hieu va, hieu van
cho hoc » khoa 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: te sach tu ngang ((cho hoc) or (co hoc)). hieu ve ((cac vuc) OR (cac cuoc)) ban hanh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu ngang ((cho hoc) OR (co hoc)). hieu ve ((cac vuc) OR (cac cuoc)) ban hanh vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu ngang ((cho hoc) or (co hoc)). hieu ve ((cac vuc) OR (cac cuoc)) ban hanh vi cua cau*".