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

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