Perhaps you should try some spelling variations:
manh hanh » xanh hanh, danh thanh, minh thanh
hieu van » hieu va, thien van, hieu ve
duc manh » suc manh, duc anh, duc minh
hanh lai » hanh lam, hanh tai, thanh lap
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
ca viet » co viet, hoa viet, san viet
va viet » hoa viet, san viet, mai viet
x hoi » xa hoi, o hoi, x ho

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang x hoi. ((hieu van) OR (lieu va)) pham duc manh hanh lai ((ca viet) OR (va viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang x hoi. ((hieu van) or (lieu va)) pham duc manh hanh lai ((ca viet) OR (va viet))~".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang x hoi. ((hieu van) or (lieu va)) pham duc manh hanh lai ((ca viet) OR (va viet))*.