Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
van tuan » van quan, van ban, anh tuan
van hanh » van thanh, ban hanh, van anh
cac vuc » cac nuoc, cac vung, cac cuoc
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va
cho hoc » co hoc, khoa hoc
ty dung » tay dung, ly dung, te dung
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: hoc sach ty dung cho hoc. ((hieu ve) OR (hieu van)) cac vuc ((van hanh) or (van tuan)) vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ty dung cho hoc. ((hieu ve) OR (hieu van)) cac vuc ((van hanh) OR (van tuan)) vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ty dung cho hoc. ((hieu ve) OR (hieu van)) cac vuc ((van hanh) or (van tuan)) vi cua cau*".