Perhaps you should try some spelling variations:
thu nang » thi nang, thu bang, tho nang
ban hanh » ban hang
thu hang » thi hang, thuc hanh, thu huong
vuc ban » vu ban, duc ban, cuc ban
cac vuc » cac nuoc, cac vung, cac cuoc
te sach » toc sach
hieu ve » hieu va, hieu van
cho hoc » co hoc, khoa hoc
cua cau » cua cac, cua chu, cua cay
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 ((thu nang) OR (thu hang)) cho hoc. ((hieu ve) or (lieu va)) cac vuc ban hanh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((thu nang) OR (thu hang)) cho hoc. ((hieu ve) OR (lieu va)) cac vuc ban hanh vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((thu nang) OR (thu hang)) cho hoc. ((hieu ve) or (lieu va)) cac vuc ban hanh vi cua cau*".