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

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