Perhaps you should try some spelling variations:
ve triet » va trien, su triet
hieu van » hieu va, thien van, lieu va
danh ve » dinh ve, hanh ve, anh ve
va danh » va dinh, va dan, va hanh
cam tuc » cam tu, nam thuc, dam thuc
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
ve ve » de ve, va ve, ke 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 ((mang may) or (nang cao)) hoi. hieu van ((cam tuc) OR (cam xuc)) va danh ve ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((mang may) OR (nang cao)) hoi. hieu van ((cam tuc) OR (cam xuc)) va danh ve ve triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((mang may) or (nang cao)) hoi. hieu van ((cam tuc) OR (cam xuc)) va danh ve ve triet*".