Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
toan cua » than cua, tan cua, doanh cua
toc sach » hoc sach, doc sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
dang xay » dang van, van xay
bac hoc » bai hoc, bac ho
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
va bac » van bac, va cac, va bai
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) OR (toc sach)) ky ((nang xa) or (dang xay)) hoi. hieu va bac hoc va thanh toan cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky ((nang xa) OR (dang xay)) hoi. hieu va bac hoc va thanh toan cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ky ((nang xa) or (dang xay)) hoi. hieu va bac hoc va thanh toan cua te".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ky ((nang xa) or (dang xay)) hoi. hieu va bac hoc va thanh toan cua te*.