Perhaps you should try some spelling variations:
manh hanh » xanh hanh, danh thanh, minh thanh
duc manh » suc manh, duc anh, duc minh
cham duc » pham duc, cham soc, pham duy
hanh lai » hanh lam, hanh tai, thanh lap
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
hieu va » hieu qua
ca viet » va viet, co viet, hoa viet
lai ca » lai cua, lai cam, loai ca
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 ky nang ((x hoi) or (x ho)). ((hieu va) or (lieu va)) cham duc manh hanh lai ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang ((x hoi) OR (x ho)). ((hieu va) OR (lieu va)) cham duc manh hanh lai ca viet.
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ((x hoi) or (x ho)). ((hieu va) or (lieu va)) cham duc manh hanh lai ca viet*.