Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
ban thanh » ban hanh, ban hang
thien van » thi van
lam duoc » nam duoc, luat duoc, lam thuoc
toan cua » than cua, tan cua, doanh cua
tu sach » thu sach, su sach, te sach
lam duc » pham duc, nam duoc, lam dung
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v 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: tu sach y nang x hoi. ((hieu va) or (thien van)) ((lam duc) OR (lam duoc)) ban thanh toan cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. ((hieu va) OR (thien van)) ((lam duc) OR (lam duoc)) ban thanh toan cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. ((hieu va) or (thien van)) ((lam duc) OR (lam duoc)) ban thanh toan cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. ((hieu va) or (thien van)) ((lam duc) OR (lam duoc)) ban thanh toan cua tre*.