Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
tang mai » tang ma, tang tai, lang mai
tu sach » thu sach, su sach, te sach
danh vi » hanh vi, dinh vi, danh di
thuc va » thuc dan, thuc day
hieu ha » hieu hoa, hieu va, hieu ca
mai hoi » mai khoi, dai hoi, lai hoi
ky tang » ky nang, ky dang, kho tang
vi cua » vai cua, di cua
cua te » cua 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 (nuoc sach)) ky tang mai hoi. hieu ha nam ((thuc va) OR (thuc vat)) danh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (nuoc sach)) ky tang mai hoi. hieu ha nam ((thuc va) OR (thuc vat)) danh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (nuoc sach)) ky tang mai hoi. hieu ha nam ((thuc va) OR (thuc vat)) danh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (nuoc sach)) ky tang mai hoi. hieu ha nam ((thuc va) OR (thuc vat)) danh vi cua te*.