Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
thu sach » thuat sach, thuoc sach, thu hoach
dang tao » sang tao, nang tao, vang tao
tao khoi » tao hoi, thao khoa, lao khoa
tu sach » su sach, te sach, tu cach
tan tai » toan tai, tang tai, tuan tai
van tai » von tai, van tuan
thuc xa » thuc xay, tuc xa, thuc va
lieu ha » lieu nha, lieu va, liem ha
ky dang » ky nang, ky danh
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: ((tu sach) OR (thu sach)) ky dang tao khoi. lieu ha nam thuc xa ((van tai) or (tan tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky dang tao khoi. lieu ha nam thuc xa ((van tai) OR (tan tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ky dang tao khoi. lieu ha nam thuc xa ((van tai) or (tan tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ky dang tao khoi. lieu ha nam thuc xa ((van tai) or (tan tai)) cua tre*.