Perhaps you should try some spelling variations:
thanh dam » thanh dat, thanh nam, thanh tam
vat thanh » dat thanh, gat thanh, tat thanh
cam thuc » am thuc, nam thuc, cam thu
tu sach » thu sach, su sach, tu cach
dam cua » dai cua, day cua, nam cua
hieu va » lieu va, hieu qua
van hoc » van hoa
van hoi » van hoa, van hoe, van loi
ky tang » ky nang, ky dang, kho tang
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao

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 (te sach)) ky tang ((van hoi) OR (van hoc)). hieu va cam thuc vat thanh dam cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky tang ((van hoi) OR (van hoc)). hieu va cam thuc vat thanh dam cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky tang ((van hoi) OR (van hoc)). hieu va cam thuc vat thanh dam cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky tang ((van hoi) OR (van hoc)). hieu va cam thuc vat thanh dam cua tre*.