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

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) OR (nuoc duc)) va tinh di cua tre~.
• 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) OR (nuoc duc)) va tinh di cua tre.
• 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) OR (nuoc duc)) va tinh di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu bach) or (so sach)) ky nang xa hoi. hieu ve ((cuoc duc) OR (nuoc duc)) va tinh di cua tre*.