Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hang dien » quang dien, dang dieu, nhan dien
su triet » su viet, ve triet
sach ky » sac ky, sach y, sach ty
hanh de » hanh ve, hanh kem
cau duc » cao duc, cau luc, chu duc
hieu va » lieu va, hieu qua
su tien » su kien, su hien, tu tieng
va cau » van cau, va cac, va dau
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ky nang o hoi. hieu va cau duc va ((hanh de) or (hang dien)) ((su triet) OR (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang o hoi. hieu va cau duc va ((hanh de) OR (hang dien)) ((su triet) OR (su tien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky nang o hoi. hieu va cau duc va ((hanh de) or (hang dien)) ((su triet) OR (su tien))".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang o hoi. hieu va cau duc va ((hanh de) or (hang dien)) ((su triet) OR (su tien))*.