Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
va trien » va truyen, va thiet, va tuyen
vu sach » vu bach, su sach, vu khach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
va cam » va cham, va cac, va cao
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai
vi va » vi van, vai va, vu va

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 ty nang ((x hoi) OR (o hoi)). lieu va cam xuc ((gia thanh) or (van hanh)) vi va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty nang ((x hoi) OR (o hoi)). lieu va cam xuc ((gia thanh) OR (van hanh)) vi va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty nang ((x hoi) OR (o hoi)). lieu va cam xuc ((gia thanh) or (van hanh)) vi va trien".
• Adding a wildcard symbol may retrieve word variants: vu sach ty nang ((x hoi) OR (o hoi)). lieu va cam xuc ((gia thanh) or (van hanh)) vi va trien*.