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