Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
nang ma » tang ma, sang ma, nang cao
va hanh » va thanh, va danh, ban hanh
vi cua » vai cua, di cua

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

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