Perhaps you should try some spelling variations:
tai hoat » toan hoat, tai khoan, tai khoa
toi hoat » toan hoat, thi hoa, thi hoan
hieu ve » hieu va, hieu van
dinh vi » dinh ve, dinh viet, dinh tri
va dinh » van dinh, va kinh, va tinh
cam loc » cam lo
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
ky sang » ky nang, ky dang, ky tang
ve cam » ve cham, ve cac, va cam
loc va » hoc 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: so sach ky sang ((tai hoat) or (toi hoat)). hieu ve cam loc va dinh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky sang ((tai hoat) OR (toi hoat)). hieu ve cam loc va dinh vi cua te.
• Adding a wildcard symbol may retrieve word variants: so sach ky sang ((tai hoat) or (toi hoat)). hieu ve cam loc va dinh vi cua te*.