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

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) OR (sac ky)) nang 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) OR (sac ky)) nang 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) OR (sac ky)) nang man hoi. hieu ve cac duc va ((hang vai) or (hang va)) cau treo*.