Perhaps you should try some spelling variations:
tam thuc » tham thuc, am thuc, nam thuc
nang cho » nang chon, ngang cho, nang cao
tu sach » thu sach, su sach, tu cach
te sach » toc sach
cho hoc » co hoc, khoa hoc
thi van » thi lan, thi hanh, thi nang
van tam » van tham, van tai, van tan
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh

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 nang cho hoc. thi van tam thuc va danh ((dai cua) or (lai chau)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang cho hoc. thi van tam thuc va danh ((dai cua) OR (lai chau)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) ky nang cho hoc. thi van tam thuc va danh ((dai cua) or (lai chau)) tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) ky nang cho hoc. thi van tam thuc va danh ((dai cua) or (lai chau)) tre*.