Perhaps you should try some spelling variations:
dien cua » dieu cua, dien cuc, dien cu
dan dien » doan dien, danh dien, dan den
sach dao » lanh dao
te sach » toc sach
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu vu » hieu va, hieu ve, dieu vu
hieu su » hieu sau, tieu su, hieu so
va dan » ca dan, va dao, va dau
cua te » cua tu
soc va » hoc va, loc va, doc va

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