Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » thien van, lieu va, hieu ve
benh dai » benh tai, benh noi, binh dan
hieu va » lieu va, hieu qua
cao duc » dao duc, cao suc, giao duc
duc van » duc va, duc tan, duc manh
bien di » bien doi, bien dai, bien do
y nang » ky nang, ly nang, v nang
cua su » qua su
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 y nang x hoi. ((hieu van) OR (hieu va)) cao duc van ((bien di) or (benh dai)) cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y nang x hoi. ((hieu van) OR (hieu va)) cao duc van ((bien di) OR (benh dai)) cua su*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach y nang x hoi. ((hieu van) OR (hieu va)) cao duc van ((bien di) or (benh dai)) cua su*".