Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
toc sach » hoc sach, doc sach, thuoc sach
hanh tai » thanh tai, hang tai, han tai
lieu nha » lieu khoa, lieu phap, lieu tham
tai cuu » tai cuc, tai buu, tai cua
xa hanh » xa thanh, xa khanh, va hanh
thuc xa » thuc xay, tuc xa, thuc va
cuu tre » cua tre, cau tren, cau treo
cao hoi » cau hoi, co hoi, cao hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) OR (toc sach)) ky nang cao hoi. ((lieu nha) or (lieu va)) nam thuc xa hanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky nang cao hoi. ((lieu nha) OR (lieu va)) nam thuc xa hanh tai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ky nang cao hoi. ((lieu nha) or (lieu va)) nam thuc xa hanh tai cuu tre*".