Perhaps you should try some spelling variations:
khang sinh » nhan sinh
sach thi » sach tai, sach thieu, sach tham
sach thu » sach thue, sach thieu, sach tham
va khang » van khang, va hang, va khong
sinh cau » trinh cau, sinh vat, sinh va
cau tren » cu tren, dau tren, ca tren
hieu va » lieu va, hieu qua
hang x » nang x, hoang xa, chang xu
va nam » van nam, ha nam, va nay
cua va » cua vat, chua va, cua van
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach thi) OR (sach thu)) hang x hoi. hieu va nam cua va khang sinh cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thi) OR (sach thu)) hang x hoi. hieu va nam cua va khang sinh cau tren".
• Adding a wildcard symbol may retrieve word variants: tu ((sach thi) OR (sach thu)) hang x hoi. hieu va nam cua va khang sinh cau tren*.