Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
lieu van » lieu va, sieu van, lieu nano
hieu van » hieu va, thien van, lieu va
nang xa » nang x, lang xa, nang ma
truc va » thuc va, thuc vat, trung va
va dan » ca dan, va dao, va dau
dan di » danh di, dan da, dan de
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: ((thu sach) or (nuoc sach)) ky nang xa hoi. ((lieu van) OR (hieu van)) cau truc va dan di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (nuoc sach)) ky nang xa hoi. ((lieu van) OR (hieu van)) cau truc va dan di cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (nuoc sach)) ky nang xa hoi. ((lieu van) OR (hieu van)) cau truc va dan di cua triet".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (nuoc sach)) ky nang xa hoi. ((lieu van) OR (hieu van)) cau truc va dan di cua triet*.