Perhaps you should try some spelling variations:
dat thanh » dao thanh, dat khanh, dang thanh
dam thanh » dao thanh, nam thanh, am thanh
toc sach » hoc sach, doc sach, thuoc sach
chu tren » cu tren, cau tren, chu trang
sach ky » sac ky, sach y, sach ty
thi van » thi lan, thi hanh, thi nang
van cam » van nam, van lam, van cau
cam tu » cam thu, nam tu, dam tu
va chu » va che, va cau, va chi

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang x ho. thi van cam tu ((dam thanh) or (dat thanh)) va chu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang x ho. thi van cam tu ((dam thanh) OR (dat thanh)) va chu tren.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang x ho. thi van cam tu ((dam thanh) or (dat thanh)) va chu tren*.