Perhaps you should try some spelling variations:
ve triet » va trien, su triet
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
su sach » so sach, vu sach
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
ve cam » ve cham, ve cac, va cam
vi ve » va ve, gi ve, ve ve

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 ((nang ma) or (tang ma)) hoi. hieu ve cam xuc ((va hanh) OR (va danh)) vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang ma) OR (tang ma)) hoi. hieu ve cam xuc ((va hanh) OR (va danh)) vi ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang ma) or (tang ma)) hoi. hieu ve cam xuc ((va hanh) OR (va danh)) vi ve triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang ma) or (tang ma)) hoi. hieu ve cam xuc ((va hanh) OR (va danh)) vi ve triet*.