Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
su triet » su viet, su tien, ve triet
hanh doi » thanh doi, hanh noi, hang doi
van chat » cao chat
van cham » van tham, va cham, van pham
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
loc va » hoc va, luc va
doi su » oi su, don su, voi su
x hoi » xa hoi, o hoi, x ho

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) or (thuoc sach)) ky nang x hoi. hieu ((van cham) OR (van chat)) loc va hanh doi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) ky nang x hoi. hieu ((van cham) OR (van chat)) loc va hanh doi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuoc sach)) ky nang x hoi. hieu ((van cham) OR (van chat)) loc va hanh doi su triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) ky nang x hoi. hieu ((van cham) OR (van chat)) loc va hanh doi su triet*.