Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
dau phuc » cau phuc, dieu phuc, dau khu
hanh tai » thanh tai, hang tai, han tai
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
phuc va » phuc vu, thuc va, chuc va
van dau » van dao, phan dau
mai hoi » mai khoi, dai hoi, lai hoi
cuu tre » cau tren, cau treo
y nang » ky nang, ly nang, v nang
ma hoi » xa hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach y nang ((ma hoi) or (mai hoi)). hieu van dau phuc va hanh tai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y nang ((ma hoi) OR (mai hoi)). hieu van dau phuc va hanh tai ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: thuoc sach y nang ((ma hoi) or (mai hoi)). hieu van dau phuc va hanh tai ((cua tre) or (cuu tre))*.