Perhaps you should try some spelling variations:
van thiet » va thiet, dan thiet, can thiet
va trinh » van trinh, va tinh, lap trinh
trinh vi » trinh va, trinh ve, trinh viet
vu sach » vu bach, su sach, vu khach
cac bao » cach bao, cac bai, cac ban
y nang » ky nang, ly nang, v nang
bao va » bao ve, tao va, ban va
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach y nang x hoi. lieu va cac bao va trinh vi van thiet~.
• Adding a wildcard symbol may retrieve word variants: vu sach y nang x hoi. lieu va cac bao va trinh vi van thiet*.