Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
hieu va » lieu va, hieu qua
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
so sanh » do sanh
dam tu » nam tu, cam tu, tam tu
va dam » van dam, va dao, va dau
vi su » va su, ve su, ki su

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) or (so sanh)) ky lang xa hoi. hieu va dam tu ((va hanh) or (va danh)) vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sanh)) ky lang xa hoi. hieu va dam tu ((va hanh) OR (va danh)) vi su triet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) ky lang xa hoi. hieu va dam tu ((va hanh) or (va danh)) vi su triet*.