Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
sach thu » sach thue, sach thieu, sach tham
sach ty » sach y, sach tu, xach tay
tinh vi » trinh vi, tinh voi, tinh va
va tinh » may tinh
cac toc » cac toi, cac nuoc, cac thoi
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
cac loc » cac lop, cac hoc, cac nuoc
vi cua » vai cua, di cua

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 ty) OR (sach thu)) nang xa hoi. hieu va ((cac loc) or (cac toc)) va tinh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach thu)) nang xa hoi. hieu va ((cac loc) OR (cac toc)) va tinh vi cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach thu)) nang xa hoi. hieu va ((cac loc) or (cac toc)) va tinh vi cua triet*".