Perhaps you should try some spelling variations:
thanh va » thanh van, thanh ha, thanh ve
cam luc » cam xuc, cau luc
hanh va » hang va, hanh vi
luc bat » suc bat, luc nhat, luat bat
cuu tre » cua tre, cau tren, cau treo
sach va » sach ha, sach dao, sach nha
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
sach xa » sach dao, sach nha, sach bai
va cam » va cham, va cac, va cao

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