Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
thu sach » tu sach, thuat sach, thuoc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cua tuc » cua duc, cua tu, luat tuc
va cao » va cac, va co, va dao
luc va » tuc va, loc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang xa hoi. hieu va cao ((luc va) or (duc va)) nhan vien ((cua tuc) OR (cua thuoc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hieu va cao ((luc va) OR (duc va)) nhan vien ((cua tuc) OR (cua thuoc)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang xa hoi. hieu va cao ((luc va) or (duc va)) nhan vien ((cua tuc) OR (cua thuoc))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu va cao ((luc va) or (duc va)) nhan vien ((cua tuc) OR (cua thuoc))*.