Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
hanh lam » thanh lap, hanh kem, hanh va
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
cua tre » cuu tre, cua triet, dua tren
duc van » duc va, duc tan, duc manh
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
may hoi » may thoi, tay hoi, mai hoi
ty mang » ty xang, ty hang, tin mang
cua te » cua tu

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) or (vu bach)) ty mang may hoi. hieu vu cham duc van hanh lam ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu bach)) ty mang may hoi. hieu vu cham duc van hanh lam ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu bach)) ty mang may hoi. hieu vu cham duc van hanh lam ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu bach)) ty mang may hoi. hieu vu cham duc van hanh lam ((cua tre) OR (cua te))*.