Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
dien cuc » dien tu, dieu cua, dien hoc
qua tham » qua cham, qua than, qua thanh
tham soc » cham soc, tham nuoc, thai son
nang xa » nang x, lang xa, nang ma
va danh » va dinh, va dan, va hanh
sach va » sach xa, sach ha, sach dao
sach v » sach y, sach 2, sach vay
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: thuoc ((sach v) OR (sach va)) nang xa hoi. hieu qua tham soc va danh ((dien cuc) or (vien cac)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc ((sach v) OR (sach va)) nang xa hoi. hieu qua tham soc va danh ((dien cuc) OR (vien cac)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc ((sach v) OR (sach va)) nang xa hoi. hieu qua tham soc va danh ((dien cuc) or (vien cac)) tre".
• Adding a wildcard symbol may retrieve word variants: thuoc ((sach v) OR (sach va)) nang xa hoi. hieu qua tham soc va danh ((dien cuc) or (vien cac)) tre*.