Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
thu sach » thuat sach, thuoc sach, thu hoach
danh sai » dung sai, danh bat, danh dau
danh vai » danh va, doanh van, dang van
hieu van » hieu va, thien van, lieu va
lam xuc » cam xuc, lam duoc
tu sach » su sach, te sach, tu cach
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 (thu sach)) ky nang o hoc. hieu van lam xuc va ((danh vai) OR (danh sai)) cua thuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang o hoc. hieu van lam xuc va ((danh vai) OR (danh sai)) cua thuoc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky nang o hoc. hieu van lam xuc va ((danh vai) OR (danh sai)) cua thuoc".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang o hoc. hieu van lam xuc va ((danh vai) OR (danh sai)) cua thuoc*.