Perhaps you should try some spelling variations:
manh hanh » xanh hanh, danh thanh, minh thanh
hieu van » hieu va, thien van, hieu ve
cham duc » pham duc, cham soc, pham duy
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
va viet » hoa viet, san viet, mai viet
lai va » loai va, mai va, dai va
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: su sach ty nang ((x hoi) or (x ho)). ((hieu van) or (lieu va)) cham duc manh hanh lai va viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ((x hoi) OR (x ho)). ((hieu van) OR (lieu va)) cham duc manh hanh lai va viet.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ((x hoi) or (x ho)). ((hieu van) or (lieu va)) cham duc manh hanh lai va viet*.