Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
dinh cuu » dinh chi
cam luc » cam xuc, cau luc
va danh » va dinh, va dan, va hanh
hieu va » lieu va
nang xa » nang x, lang xa, nang ma
sach v » sach va, sach y, sach 2
luc va » duc va, tuc va, loc va
di cuu » di cau, di cua
v nang » va nang, vu nang, van nang

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 nang xa hoi. ((hieu va) or (hieu qua)) cam luc va danh ((di cuu) OR (dinh cuu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach v nang xa hoi. ((hieu va) OR (hieu qua)) cam luc va danh ((di cuu) OR (dinh cuu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach v nang xa hoi. ((hieu va) or (hieu qua)) cam luc va danh ((di cuu) OR (dinh cuu)) tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach v nang xa hoi. ((hieu va) or (hieu qua)) cam luc va danh ((di cuu) OR (dinh cuu)) tre*.