Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
van hanh » van thanh, ban hanh, van anh
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
cho hoc » co hoc, khoa hoc
ly hang » ly quang
ty hang » thi hang, thu hang
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: doc sach ((((ty hang) OR (ly hang))) or (ty xang)) cho hoc. hieu ve cac xuc van hanh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ((((ty hang) OR (ly hang))) OR (ty xang)) cho hoc. hieu ve cac xuc van hanh vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ((((ty hang) OR (ly hang))) or (ty xang)) cho hoc. hieu ve cac xuc van hanh vi cua cau*".