Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hoc sach » hoc sinh, hoc cac, hoc anh
tham dua » tham du, pham duc, thi dua
pham duy » pham duc
ban hanh » ban hang
sach ky » sac ky, sach y, sach ty
hanh di » hanh vi, hanh de, hang di
di cua » dai cua, doi cua, de cua
x hoi » o hoi, x ho, 5 hoi

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

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