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, su tien, ve triet
nang co » nang cao, nang doc, nang noi
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
cau duc » cao duc, cau luc, chu duc
hanh de » hanh ve, hanh kem
nang o » nang ho, nang ro, nang x
va cau » van cau, va cac, va dau

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