Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuoc sinh
thuat sach » thuat lanh, thuat san
cao luc » bao luc, cao duc, cao suc
hieu va » lieu va, hieu qua
le cua » ly cua
de cua » te cua, dieu cua
va dau » va dao
va cao » va cac, va co, va dao
luc va » duc va, tuc va, loc va
v nang » va nang, vu nang, van nang
x hoi » xa hoi, o hoi, x ho

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

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