Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
thuc dan » thuc hanh, hoc dan
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
ky lang » ky dang, ky tang, tay lang
vai cua » dai cua, hai cua, lai cua
ha hoi » hoa hoi, ha noi, xa hoi
van am » van nam, van lam, van dam

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 lang) OR (ky nang)) ha hoi. hieu van am ((thuc dan) or (thuc vat)) hanh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky lang) OR (ky nang)) ha hoi. hieu van am ((thuc dan) OR (thuc vat)) hanh vai cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky lang) OR (ky nang)) ha hoi. hieu van am ((thuc dan) or (thuc vat)) hanh vai cua triet*".