Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cuoc duc » nuoc duc, duoc duoc, cuoc doi
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve cuoc » va cuoc, ve duoc, ve nuoc
va tinh » may tinh
tinh di » tinh doi, trinh di, tinh da
cua tre » cua te, cuu tre, dua tren

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu bach) or (so sach)) ky nang xa hoi. hieu ve cuoc duc va tinh di ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu bach) OR (so sach)) ky nang xa hoi. hieu ve cuoc duc va tinh di ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu bach) or (so sach)) ky nang xa hoi. hieu ve cuoc duc va tinh di ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: ((vu bach) or (so sach)) ky nang xa hoi. hieu ve cuoc duc va tinh di ((cua tre) OR (cua triet))*.