Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
cam loc » cam lo
vu sach » vu bach, su sach, vu khach
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
van cam » van nam, van lam, van cau
loc va » hoc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach y ((nang ma) or (sang ma)) hoi. hieu van cam loc va danh vi ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y ((nang ma) OR (sang ma)) hoi. hieu van cam loc va danh vi ((cua triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: vu sach y ((nang ma) or (sang ma)) hoi. hieu van cam loc va danh vi ((cua triet) or (cua viet))*.