Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
va hanh » van hanh, va thanh, va danh
sach tu » sach thu, cach tu, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
tu nang » tru nang, tu nong, tu nano
tai cua » thai cua, tai cuc, tri cua
va cao » va co, va dao, va bao
xuc va » duc va, tuc va, luc va

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 tu nang ((mai hoi) or (xa hoi)). hieu ((va cac) or (va cao)) xuc va hanh tai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu nang ((mai hoi) OR (xa hoi)). hieu ((va cac) OR (va cao)) xuc va hanh tai cua vat.
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang ((mai hoi) or (xa hoi)). hieu ((va cac) or (va cao)) xuc va hanh tai cua vat*.