Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
ninh viet » sinh vien, anh viet
doc sach » hoc sach, nuoc sach, dac sac
toc sach » hoc sach, thuoc sach, nuoc sach
thuc dan » thuc hanh, hoc dan, thuc vat
dan ninh » dang ninh, dao ninh, dan minh
ca triet » cua triet, cau triet, va triet
nang xa » nang x, lang xa, nang ma
va nham » va cham, va tham, va nha
viet ca » viet ha, viet co, viet a
y nang » ky nang, ly nang, v nang

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) or (toc sach)) y nang xa hoi. lieu va nham thuc dan ninh viet ca triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc sach) OR (toc sach)) y nang xa hoi. lieu va nham thuc dan ninh viet ca triet.
• Adding a wildcard symbol may retrieve word variants: ((doc sach) or (toc sach)) y nang xa hoi. lieu va nham thuc dan ninh viet ca triet*.