Perhaps you should try some spelling variations:
trinh lam » trinh lap, trinh tam, trinh cam
cua triet » cua viet, su triet, va triet
va trinh » van trinh, va tinh, lap trinh
su sach » vu sach
so sach » so sanh, bo sach, co sach
ky lang » ky nang, ky tang, tay lang
ky dang » ky nang, ky danh
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
lam cua » nam cua, lam chat

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) or (so sach)) ((ky lang) OR (ky dang)) ha noi. hieu va cac duc va trinh lam cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ((ky lang) OR (ky dang)) ha noi. hieu va cac duc va trinh lam cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) ((ky lang) OR (ky dang)) ha noi. hieu va cac duc va trinh lam cua triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ((ky lang) OR (ky dang)) ha noi. hieu va cac duc va trinh lam cua triet*.