Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su triet » su tien, ve triet
va hanh » van hanh, va thanh, va danh
cam loc » cam lo
sach ky » sac ky, sach y, sach kem
van cam » van nam, van lam, van cau
sach ty » sach y, sach tu, sach thu
su viet » so viet
loc va » hoc va, luc va
x hoi » xa hoi, o hoi, x ho

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 ky) OR (sach ty)) nang x hoi. hieu van cam loc va hanh vi ((su triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach ty)) nang x hoi. hieu van cam loc va hanh vi ((su triet) OR (su viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sach ty)) nang x hoi. hieu van cam loc va hanh vi ((su triet) or (su viet))".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sach ty)) nang x hoi. hieu van cam loc va hanh vi ((su triet) or (su viet))*.