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