Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
nang man » nang ma, nang ban, nang can
hang vai » hang tai, hang hai, hang vi
lang man » lang van, lang ban, lang mai
cac duc » cac du, cao duc, cac dac
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang man) OR (lang man)) hoi. hieu ve cac duc va ((hang vai) OR (hang va)) cau treo~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang man) OR (lang man)) hoi. hieu ve cac duc va ((hang vai) or (hang va)) cau treo~".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang man) OR (lang man)) hoi. hieu ve cac duc va ((hang vai) or (hang va)) cau treo*.