Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
te sach » toc sach
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
quoc so » quoc son, nuoc so, quoc lo
quoc co » quoc cao, quoc cho, duoc co
benh de » benh ve, benh he, menh de
de cua » le cua, te cua, dieu cua
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 _ lang xa hoi. ((hieu van) or (hieu va)) cau ((quoc so) OR (quoc co)) benh de cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach _ lang xa hoi. ((hieu van) OR (hieu va)) cau ((quoc so) OR (quoc co)) benh de cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach _ lang xa hoi. ((hieu van) or (hieu va)) cau ((quoc so) OR (quoc co)) benh de cua te".
• Adding a wildcard symbol may retrieve word variants: te sach _ lang xa hoi. ((hieu van) or (hieu va)) cau ((quoc so) OR (quoc co)) benh de cua te*.