Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cua thuoc » nha thuoc, cay thuoc, cua quoc
cua nuoc » cua quoc, cua nguoi, nha nuoc
hieu van » hieu va, thien van, lieu va
lam xuc » cam xuc, lam duoc
danh va » doanh va, hanh va, anh va
va danh » va dinh, va dan, va hanh
tu sach » thu sach, su sach, te sach
van lam » van nam
xuc va » duc va, tuc va, luc va
nang o » nang co, nang ho, nang ro
o hoc » co hoc, mo hoc, so hoc

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) or (thuat sach)) ky nang o hoc. hieu van lam xuc va danh va ((cua thuoc) OR (cua nuoc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat sach)) ky nang o hoc. hieu van lam xuc va danh va ((cua thuoc) OR (cua nuoc)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuat sach)) ky nang o hoc. hieu van lam xuc va danh va ((cua thuoc) OR (cua nuoc))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat sach)) ky nang o hoc. hieu van lam xuc va danh va ((cua thuoc) OR (cua nuoc))*.