Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cham xuc » cam xuc, chat xuc, pham duc
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
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: thu sach ky ((nang ma) or (nang x)) hoi. hieu ve ((cham xuc) OR (cham soc)) va hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang ma) OR (nang x)) hoi. hieu ve ((cham xuc) OR (cham soc)) va hanh vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang ma) or (nang x)) hoi. hieu ve ((cham xuc) OR (cham soc)) va hanh vi su triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang ma) or (nang x)) hoi. hieu ve ((cham xuc) OR (cham soc)) va hanh vi su triet*.