Perhaps you should try some spelling variations:
van phat » va phat, van chat, van phan
hieu van » hieu va, thien van, lieu va
phat duc » pham duc, phan duc, phan duoc
van hanh » van thanh, ban hanh, van anh
so sach » so sanh, bo sach, co sach
duc van » duc va, duc tan, duc manh
tai cua » thai cua, tri cua, dai cua
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y nang ((x hoi) or (x ho)). hieu van phat duc van hanh ((tai cua) OR (tai cuc)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang ((x hoi) OR (x ho)). hieu van phat duc van hanh ((tai cua) OR (tai cuc)) te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang ((x hoi) or (x ho)). hieu van phat duc van hanh ((tai cua) OR (tai cuc)) te*".