Perhaps you should try some spelling variations:
thue nang » thien nang, thuat nang, chuc nang
toc sach » hoc sach, doc sach, thuoc sach
thi nang » thi cong, ki nang, thi hanh
luu van » cuu van, luan van, luu hanh
luc van » luoc van, duc van, luc va
hieu ve » hieu va, hieu van
cho hoc » co hoc, khoa hoc
cua cau » cua cac, cua chu, cua cay
ve cau » ke cau, va cau, ve cac
anh vi » hanh vi, anh va, anh ve
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((thue nang) OR (thi nang)) cho hoc. hieu ve cau ((luc van) OR (luu van)) anh vi cua cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((thue nang) OR (thi nang)) cho hoc. hieu ve cau ((luc van) or (luu van)) anh vi cua cau~".
• Adding a wildcard symbol may retrieve word variants: toc sach ((thue nang) OR (thi nang)) cho hoc. hieu ve cau ((luc van) or (luu van)) anh vi cua cau*.