Perhaps you should try some spelling variations:
danh doi » danh di, thanh doi, dung doi
te sach » toc sach
hieu va » lieu va, hieu qua
doi cua » dai cua, hoi cua, dong cua
nang xa » nang x, nang ma, mang xa
va danh » va dinh, va dan, va hanh
lang xa » lang ha, dang xay, lang van
hieu ve » hieu van
soc va » hoc va, loc va, doc va
cua te » cua tu
sach v » sach va, sach y, sach 2

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 v ((nang xa) or (lang xa)) hoi. ((hieu ve) OR (hieu va)) cham soc va danh doi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach v ((nang xa) OR (lang xa)) hoi. ((hieu ve) OR (hieu va)) cham soc va danh doi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach v ((nang xa) or (lang xa)) hoi. ((hieu ve) OR (hieu va)) cham soc va danh doi cua te".
• Adding a wildcard symbol may retrieve word variants: te sach v ((nang xa) or (lang xa)) hoi. ((hieu ve) OR (hieu va)) cham soc va danh doi cua te*.