Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thanh toan » thanh hoa, thanh san, tinh toan
thu sach » tu sach, thuat sach, thu hoach
hieu van » thien van, lieu va, hieu ve
toan cua » than cua, tan cua, doanh cua
ty nang » ky nang, ty xang, ty hang
hieu va » lieu va, hieu qua
xuc gia » duc gia, luc gia, tuc gia
nang o » nang co, nang ho, nang ro
cua te » cua tu
o hoi » co hoi, o hoc, o hai

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) or (thuoc sach)) ty nang o hoi. ((hieu van) OR (hieu va)) cam xuc gia thanh toan cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuoc sach)) ty nang o hoi. ((hieu van) OR (hieu va)) cam xuc gia thanh toan cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (thuoc sach)) ty nang o hoi. ((hieu van) OR (hieu va)) cam xuc gia thanh toan cua te".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thuoc sach)) ty nang o hoi. ((hieu van) OR (hieu va)) cam xuc gia thanh toan cua te*.