Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
cua viet » ca viet, hoa viet, cua vat
hanh vai » hanh vi, hanh va, hanh tai
sach ki » sach kinh, sach bai, sach kem
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
ki nang » ky nang
tuc va » thuc va, truc va, tuc xa
ve tai » te tai, de tai, le tai

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ki nang x ho. hieu ((ve tai) OR (va cac)) tuc va hanh vai ((cua viet) OR (su triet))~.
• Adding a wildcard symbol may retrieve word variants: su sach ki nang x ho. hieu ((ve tai) or (va cac)) tuc va hanh vai ((cua viet) or (su triet))*.