Perhaps you should try some spelling variations:
thi hoan » thi hoa, thi hanh, thi hong
tai khoa » da khoa, noi khoa
toi hoat » toan hoat, thi hoa, thi hoai
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
cam luc » cam xuc, cau luc
hieu ve » hieu va, hieu van
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
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

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 khoa) or (((toi hoat) or (thi hoan)))). hieu ve cam luc va danh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky sang ((tai khoa) OR (((toi hoat) OR (thi hoan)))). hieu ve cam luc va danh vi cua tu.
• Adding a wildcard symbol may retrieve word variants: so sach ky sang ((tai khoa) or (((toi hoat) or (thi hoan)))). hieu ve cam luc va danh vi cua tu*.