Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh vai » thanh hai, thanh van, thanh tai
thu sach » tu sach, thuat sach, thuoc sach
sang mai » sang ma, sang tai, lang mai
mai khoi » mai khoa, tai khoa, cac khoi
luc van » luoc van, luu van, duc van
la tren » loai tren, dua tren, dat tren
y sang » _ sang, duy sang
ve cau » ke cau, va cau, le cau
ve cac » va cac, vien cac
vai la » tai la, vai va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y sang mai khoi. hieu ((ve cau) or (ve cac)) luc van thanh vai la tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y sang mai khoi. hieu ((ve cau) OR (ve cac)) luc van thanh vai la tren.
• Adding a wildcard symbol may retrieve word variants: thu sach y sang mai khoi. hieu ((ve cau) or (ve cac)) luc van thanh vai la tren*.