Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
qua cham » qua hai, qua cac, va cham
cham duc » pham duc, cham soc, pham duy
van hanh » van thanh, ban hanh, van anh
hanh tai » thanh tai, hang tai, han tai
va triet » va thiet, va trien, ve triet
ty sang » ty xang, ty hang, duy sang
sang ma » tang ma, nang ma, sang tao
duc van » duc va, duc tan, duc manh
ma hoi » mai hoi, xa hoi, ma hoa
tai va » thai va, mai va, tri va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu hoach) or (thuoc sach)) ty sang ma hoi. hieu qua cham duc van hanh tai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu hoach) OR (thuoc sach)) ty sang ma hoi. hieu qua cham duc van hanh tai va triet.
• Adding a wildcard symbol may retrieve word variants: ((thu hoach) or (thuoc sach)) ty sang ma hoi. hieu qua cham duc van hanh tai va triet*.