Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » hieu va, thien van, lieu va
thu sach » tu sach, thuat sach, thu hoach
danh tai » doanh tai, dinh tai, hanh tai
nam thuc » nam thuoc, am thuc, nam thu
su sach » so sach, vu sach
tai cua » thai cua, tai cuc, tri cua
va danh » va dinh, va dan, va hanh
thuc va » thuc vat, thuc dan, thuc day
sang xa » song xa, lang xa, sang ma
ky sang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet

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) or (((thu sach) or (thuoc sach)))) ky sang xa hoi. hieu van nam thuc va danh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (((thu sach) OR (thuoc sach)))) ky sang xa hoi. hieu van nam thuc va danh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (((thu sach) or (thuoc sach)))) ky sang xa hoi. hieu van nam thuc va danh tai cua tre*.