Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
danh tai » doanh tai, dinh tai, hanh tai
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
tai cuu » tai cuc, tai buu, tai cua
va danh » va dinh, va dan, va hanh
van dam » van nam, van dao, van dau
sang xa » song xa, lang xa, sang ma
ky sang » ky nang, ky dang, ky tang
cuu tre » cua tre, cau tren, cau treo
dam tu » nam tu, cam tu, tam tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (((thu hoach) or (thuoc sach)))) ky sang xa hoi. hieu van dam tu va danh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (((thu hoach) OR (thuoc sach)))) ky sang xa hoi. hieu van dam tu va danh tai cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (((thu hoach) or (thuoc sach)))) ky sang xa hoi. hieu van dam tu va danh tai cuu tre*.