Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cua triet » cua viet, su triet, va triet
than duc » tran duc, phan duc, than doc
ban hanh » ban hang
tham duc » pham duc, tham du, thach duc
sach ky » sac ky, sach y, sach ty
hanh de » hanh ve, hanh kem
de cua » le cua, te cua, dieu cua
o hoc » co hoc, mo hoc, so hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ky nang ((o hoc) or (xa hoi)). lieu va ((tham duc) OR (than duc)) ban hanh de cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky nang ((o hoc) OR (xa hoi)). lieu va ((tham duc) OR (than duc)) ban hanh de cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky nang ((o hoc) or (xa hoi)). lieu va ((tham duc) OR (than duc)) ban hanh de cua triet".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky nang ((o hoc) or (xa hoi)). lieu va ((tham duc) OR (than duc)) ban hanh de cua triet*.