Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban thanh » ban hanh, ban hang
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
va hanh » van hanh, va thanh, va danh
sach ty » sach y, sach tu, sach thu
su sach » so sach, vu sach
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
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: su sach ty ((nang xa) OR (nang ma)) hoi. hieu ve cac nuoc ((va hanh) or (ban thanh)) vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang xa) OR (nang ma)) hoi. hieu ve cac nuoc ((va hanh) OR (ban thanh)) vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((nang xa) OR (nang ma)) hoi. hieu ve cac nuoc ((va hanh) or (ban thanh)) vi cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang xa) OR (nang ma)) hoi. hieu ve cac nuoc ((va hanh) or (ban thanh)) vi cua triet*.