Perhaps you should try some spelling variations:
van thiet » va thiet, dan thiet, can thiet
vu sach » vu bach, su sach, vu khach
hieu va » lieu va, hieu qua
va tinh » may tinh
tinh vi » trinh vi, tinh voi, tinh va
y nang » ky nang, ly nang, v nang
bai va » mai va, ban va, dai 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. hieu va cac bai va tinh vi van thiet~.
• Adding a wildcard symbol may retrieve word variants: vu sach y nang x hoi. hieu va cac bai va tinh vi van thiet*.