Perhaps you should try some spelling variations:
chau viet » chu viet, khau viet, cham viet
xanh hanh » danh thanh, ban hanh, van hanh
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
duc xanh » duc anh, duc manh, duc hanh
hanh lai » hanh lam, hanh tai, thanh lap
tu sach » thu sach, su sach, te sach
ty nang » ty xang, ly nang, ty nong
ty hang » ly hang, ty xang, thi hang
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: tu sach ((((ty nang) or (ty hang))) or (ky nang)) x hoi. hieu van pham duc xanh hanh lai chau viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((((ty nang) OR (ty hang))) OR (ky nang)) x hoi. hieu van pham duc xanh hanh lai chau viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ((((ty nang) or (ty hang))) or (ky nang)) x hoi. hieu van pham duc xanh hanh lai chau viet*.