Perhaps you should try some spelling variations:
cam truc » nam truc, lam truoc, nam truoc
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
vu nang » vuc nang, va nang, vu dang
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
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: su sach ((y nang) or (vu nang)) ma hoa. hieu ve ((cam truc) OR (cau truc)) va hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (vu nang)) ma hoa. hieu ve ((cam truc) OR (cau truc)) va hanh vi su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) or (vu nang)) ma hoa. hieu ve ((cam truc) OR (cau truc)) va hanh vi su triet*".