Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
ve cam » ve cham, va cam, ve cai
ve cac » va cac
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang x ho. hieu ((ve cam) or (((ve cac) or (vien cac)))) truc va hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x ho. hieu ((ve cam) OR (((ve cac) OR (vien cac)))) truc va hanh vi su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x ho. hieu ((ve cam) or (((ve cac) or (vien cac)))) truc va hanh vi su triet*.