Perhaps you should try some spelling variations:
nham nang » phap nang, kha nang, nhan dang
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
cac xuc » cam xuc, cac nuoc, chat xuc
doi cua » dai cua, hoi cua
xuc va » duc va, tuc va, luc va
va dan » ca dan, va dao, va dau
do cua » co cua, de cua, dong cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((nham nang) OR (cam nang)) xa hoi. hieu va cac xuc va dan ((do cua) or (doi cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((nham nang) OR (cam nang)) xa hoi. hieu va cac xuc va dan ((do cua) OR (doi cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((nham nang) OR (cam nang)) xa hoi. hieu va cac xuc va dan ((do cua) or (doi cua)) te".
• Adding a wildcard symbol may retrieve word variants: so sach ((nham nang) OR (cam nang)) xa hoi. hieu va cac xuc va dan ((do cua) or (doi cua)) te*.