Perhaps you should try some spelling variations:
ninh viet » sinh vien, anh viet
doc sach » hoc sach, nuoc sach, dac sac
toc sach » hoc sach, thuoc sach, nuoc sach
nham thu » nham thuc, nam thu, pham thu
viet cua » viec cua, viet ca, viet qua
cao hoi » cau hoi, co hoi, cao hoc
va nham » va cham, va tham, va nha
va ninh » van ninh, va kinh, va tinh
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
thu va » thuc va, thue va, tu va

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 cao hoi. lieu va nham thu va ninh viet cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc sach) OR (toc sach)) y nang cao hoi. lieu va nham thu va ninh viet cua tre".
• Adding a wildcard symbol may retrieve word variants: ((doc sach) OR (toc sach)) y nang cao hoi. lieu va nham thu va ninh viet cua tre*.