Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hanh tai » thanh tai, hang tai, han tai
cham hoi » cham voi, cham h'roi, pham hoai
tai cua » thai cua, tai cuc, tri cua
va hanh » van hanh, va thanh, va danh
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
may hoi » may thoi, tay hoi, may hmi
ty mang » ty xang, ty hang, tin mang
cua tre » cua te, cuu tre, cua triet
cam lo » nam lo, cam ly, cam o

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ty mang ((may hoi) OR (mai hoi)). hieu ve ((cham hoi) or (cam lo)) va hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ty mang ((may hoi) OR (mai hoi)). hieu ve ((cham hoi) OR (cam lo)) va hanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ty mang ((may hoi) OR (mai hoi)). hieu ve ((cham hoi) or (cam lo)) va hanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach ty mang ((may hoi) OR (mai hoi)). hieu ve ((cham hoi) or (cam lo)) va hanh tai cua tre*.