Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
su triet » su viet, ve triet
hang di » hang doi, hang vi, hang dien
hanh de » hanh ve, hanh kem
cam duc » cam xuc, cao duc, pham duc
su tien » su kien, su hien, tu tieng
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao
nang o » nang co, nang ho, nang ro
o hai » co hai, so hai, o lai

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 y nang o hai. lieu va cam duc va ((hanh de) or (hang di)) ((su triet) OR (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y nang o hai. lieu va cam duc va ((hanh de) OR (hang di)) ((su triet) OR (su tien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y nang o hai. lieu va cam duc va ((hanh de) or (hang di)) ((su triet) OR (su tien))".
• Adding a wildcard symbol may retrieve word variants: thuat sach y nang o hai. lieu va cam duc va ((hanh de) or (hang di)) ((su triet) OR (su tien))*.