Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
quoc ban » quoc bao, quoc lan, quoc quan
sang cho » danh cho, dung cho, sang tao
xuc ban » duc ban, cuc ban, xuat ban
hieu ve » hieu va, hieu van
cho hoc » co hoc, khoa hoc
ty sang » ty xang, ty hang, duy sang
cua cau » cua cac, cua chu, cua cay
ve cac » va cac, vien cac
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) OR (toc sach)) ty sang cho hoc. hieu ve cac ((xuc ban) or (quoc ban)) hanh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty sang cho hoc. hieu ve cac ((xuc ban) OR (quoc ban)) hanh vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ty sang cho hoc. hieu ve cac ((xuc ban) or (quoc ban)) hanh vi cua cau*".