Perhaps you should try some spelling variations:
sang mai » sang ma, sang tai, lang mai
thi nang » thi cong, ki nang, thi hanh
su sach » so sach, vu sach
cac tac » cac toc, cac bac, cac dac
sach ty » sach y, sach tu, sach thu
cac tuc » cac toc, cac nuoc, cac cuoc
cuu tre » cua tre, cau tren, cau treo
mai hoi » mai khoi, dai hoi, lai hoi
ty sang » ty xang, ty hang, duy sang
cac tu » cac thu, cach tu, cac du
ca dan » cac dan, ca dao
dan va » doan va, dan ca, ban va
va cuu » va cau, va chu, va huu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty sang mai hoi. thi nang ((((cac tuc) or (cac tu))) or (cac tac)) ca dan va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty sang mai hoi. thi nang ((((cac tuc) OR (cac tu))) OR (cac tac)) ca dan va cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty sang mai hoi. thi nang ((((cac tuc) or (cac tu))) or (cac tac)) ca dan va cuu tre*.