Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hanh dao » lanh dao, thanh dat, thanh dam
hieu van » hieu va, thien van, lieu va
cau phuc » cau truc, chau phu, huu phuc
van cau » van dau, van hau, van chat
sach ky » sac ky, sach y, sach ty
phuc va » phuc vu, thuc va, chuc va
va hanh » van hanh, va thanh, va danh
nang ma » tang ma, sang ma, mang may
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo

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 ma) OR (nang cao)) hoi. hieu van cau phuc va hanh dao ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky ((nang ma) OR (nang cao)) hoi. hieu van cau phuc va hanh dao ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky ((nang ma) OR (nang cao)) hoi. hieu van cau phuc va hanh dao ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky ((nang ma) OR (nang cao)) hoi. hieu van cau phuc va hanh dao ((cua tre) or (cuu tre))*.