Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thi hang » thi hanh, thi nang, thi hong
hang cho » sang cho, hang khoa, phong cho
dung van » duong van, dung va, dang van
duc van » duc va, duc tan, duc manh
hieu ve » hieu va, hieu van
cua cau » cua cac, cua chu, cua cay
cho hoc » co hoc, khoa hoc
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)) thi hang cho hoc. hieu ve cac ((duc van) or (dung van)) hanh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) thi hang cho hoc. hieu ve cac ((duc van) OR (dung van)) hanh vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) thi hang cho hoc. hieu ve cac ((duc van) or (dung van)) hanh vi cua cau*".