Perhaps you should try some spelling variations:
sang tai » hang tai, sang tao, tang tai
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
dinh vi » dinh ve, dinh viet, dinh tri
va dinh » van dinh, va kinh, va tinh
cam luc » cam xuc, cau luc
hieu va » lieu va
hieu ve » hieu van
tai hai » thi hai, dai hai, tai ha
ky sang » ky nang, ky dang, ky tang
luc va » duc va, tuc va, loc 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: su sach ky sang tai hai. ((hieu ve) or (((hieu va) or (hieu qua)))) cam luc va dinh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky sang tai hai. ((hieu ve) OR (((hieu va) OR (hieu qua)))) cam luc va dinh vi cua te.
• Adding a wildcard symbol may retrieve word variants: su sach ky sang tai hai. ((hieu ve) or (((hieu va) or (hieu qua)))) cam luc va dinh vi cua te*.