Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
manh hanh » xanh hanh, danh thanh, minh thanh
cua triet » cua viet, su triet, va triet
qua cham » qua hai, qua cac, va cham
cham duc » pham duc, cham soc, pham duy
duc manh » suc manh, duc anh, duc minh
hanh tai » thanh tai, hang tai, han tai
ty sang » ty xang, ty hang, duy sang
sang ma » tang ma, nang ma, sang tao
tai cua » thai cua, tai cuc, tri cua
ma hoi » mai hoi, xa hoi, ma hoa

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 manh hanh tai cua 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 manh hanh tai cua triet.
• Adding a wildcard symbol may retrieve word variants: ((thu hoach) or (thuoc sach)) ty sang ma hoi. hieu qua cham duc manh hanh tai cua triet*.