Perhaps you should try some spelling variations:
sang mai » sang tai, lang mai, hoang mai
cham xuc » cam xuc, chat xuc, pham duc
su sach » so sach, vu sach
hanh ca » hanh cac, hanh cat, hanh cua
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
sang ma » tang ma, nang ma, sang tao
su viet » so viet
ca su » cua su, cao su, ca sau

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