Perhaps you should try some spelling variations:
sach ky » sach y, sach ty, sach kem
cao hoi » co hoi, cao hoc, tao hoi
hieu ve » hieu va, hieu van
cac xuc » cam xuc, cac nuoc, chat xuc
va hanh » van hanh, va thanh, va danh
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
xuc va » duc va, tuc va, luc va
vi cua » vai cua, di cua
cua te » cua tu

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) or (sac ky)) nang ((cao hoi) OR (cau hoi)). hieu ve cac xuc va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sac ky)) nang ((cao hoi) OR (cau hoi)). hieu ve cac xuc va hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) or (sac ky)) nang ((cao hoi) OR (cau hoi)). hieu ve cac xuc va hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sac ky)) nang ((cao hoi) OR (cau hoi)). hieu ve cac xuc va hanh vi cua te*.