Perhaps you should try some spelling variations:
sang lao » sang tao, sang lap, tang lao
lao khoa » lo khoa, da khoa, ly khoa
va triet » va thiet, va trien, ve triet
nam thuc » nam thuoc, am thuc, nam thu
than tai » thanh tai, toan tai, nhan tai
tu sach » thu sach, su sach, te sach
han tai » hang tai, nhan tai, van tai
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan, thuc day
lieu ha » lieu nha, lieu va, liem ha
ky sang » ky nang, ky dang, ky tang

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 ky sang lao khoa. lieu ha nam thuc va ((han tai) or (than tai)) ((va triet) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang lao khoa. lieu ha nam thuc va ((han tai) OR (than tai)) ((va triet) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang lao khoa. lieu ha nam thuc va ((han tai) or (than tai)) ((va triet) or (cuu tre))*.