Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
van thanh » ban thanh, van tuan
thu sach » tu sach, thuat sach, thuoc sach
dat tren » dat trong, dua tren
lang man » lang van, lang ban, lang mai
man hoi » man hoai, dan hoi, van hoi
sach ky » sac ky, sach y, sach ty
luc van » luoc van, luu van, duc van
ky lang » ky nang, ky dang, ky tang
vai dat » cai dat, va dat, van dat
ve cau » ke cau, va cau, le cau
ve cac » va cac, vien cac

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 ky lang man hoi. hieu ((ve cau) or (ve cac)) luc van thanh vai dat tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky lang man hoi. hieu ((ve cau) OR (ve cac)) luc van thanh vai dat tren.
• Adding a wildcard symbol may retrieve word variants: thu sach ky lang man hoi. hieu ((ve cau) or (ve cac)) luc van thanh vai dat tren*.