Perhaps you should try some spelling variations:
trinh doc » trinh do, trinh hoa, trinh co
cua triet » cua viet, su triet, va triet
dang xay » dang van, van xay
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tac, cac nuoc
doc cua » hoc cua, doi cua, do cua
cac tu » cac thu, cach tu, cac du

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky ((nang x) or (dang xay)) hoi. hieu va ((cac tuc) OR (cac tu)) lap trinh doc cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang x) OR (dang xay)) hoi. hieu va ((cac tuc) OR (cac tu)) lap trinh doc cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang x) or (dang xay)) hoi. hieu va ((cac tuc) OR (cac tu)) lap trinh doc cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang x) or (dang xay)) hoi. hieu va ((cac tuc) OR (cac tu)) lap trinh doc cua triet*.