Perhaps you should try some spelling variations:
cam viet » cham viet, ca viet, cao viet
hanh lai » hanh lam, hanh tai, thanh lap
duc minh » duc anh
duc manh » suc manh, duc anh, duc tan
va cham » va chat, va tham
lai cam » lai nam, lai tam, lai chau
tu sach » thu sach, su sach, te sach
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
hieu va » lieu va, hieu qua
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)) x hoi. hieu va cham ((duc manh) OR (duc minh)) hanh lai cam viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ty hang)) x hoi. hieu va cham ((duc manh) OR (duc minh)) hanh lai cam viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) or (ty hang)) x hoi. hieu va cham ((duc manh) OR (duc minh)) hanh lai cam viet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ty hang)) x hoi. hieu va cham ((duc manh) OR (duc minh)) hanh lai cam viet*.