Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, hieu ve
cham duc » pham duc, cham soc, pham duy
ban hanh » ban hang
hanh lai » hanh lam, hanh tai, thanh lap
tu sach » thu sach, su sach, te sach
ty nang » ty xang, ty hang, ly nang
duc ban » duc tan, duc van, dua ban
ca viet » va viet, co viet, hoa viet
lai ca » lai cua, lai cam, loai ca
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 (ky nang)) x hoi. ((hieu van) or (lieu va)) cham duc ban hanh lai ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ky nang)) x hoi. ((hieu van) OR (lieu va)) cham duc ban hanh lai ca viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ky nang)) x hoi. ((hieu van) or (lieu va)) cham duc ban hanh lai ca viet*.