Perhaps you should try some spelling variations:
trinh hoa » trinh do, trinh han
dang xay » dang van, van xay
va triet » va thiet, va trien, ve triet
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
tuc lap » truc lap, tuc tap, tu lap
hoa va » hoa van, hoa xa, hoa vo

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky ((nang x) or (dang xay)) hoi. hieu va cac tuc lap trinh hoa va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky ((nang x) OR (dang xay)) hoi. hieu va cac tuc lap trinh hoa va triet.
• Adding a wildcard symbol may retrieve word variants: so sach ky ((nang x) or (dang xay)) hoi. hieu va cac tuc lap trinh hoa va triet*.