Perhaps you should try some spelling variations:
nham nang » phap nang, cam nang, kha nang
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
khoa hoc » hoa hoc
hieu ve » hieu va, hieu van
cac luc » cau luc, coc luc, cac nuoc
luc van » luoc van, luu van, duc van
minh vi » minh voi, dinh vi, minh va
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: ((toc sach) OR (doc sach)) nham nang ((khoa hoc) or (co hoc)). hieu ve cac luc van minh vi cua cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) nham nang ((khoa hoc) OR (co hoc)). hieu ve cac luc van minh vi cua cac*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (doc sach)) nham nang ((khoa hoc) or (co hoc)). hieu ve cac luc van minh vi cua cac*".