Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
sach thu » sach thue, sach thieu, sach tham
hieu van » hieu va, thien van, lieu va
via cua » gia cua, gian cua, giau cua
dan via » dan va, dan gia, dan gian
cua tre » cua te, cuu tre, cua triet
thuc va » thuc vat, thuc day
sach ty » sach y, sach tu, xach tay
lang xa » lang ha, dang xay, lang van
van am » van nam, van lam, van dam

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach ty) or (sach thu)) lang xa hoi. hieu van am ((thuc va) or (thuc dan)) dan via cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ty) OR (sach thu)) lang xa hoi. hieu van am ((thuc va) OR (thuc dan)) dan via cua tre.
• Adding a wildcard symbol may retrieve word variants: toc ((sach ty) or (sach thu)) lang xa hoi. hieu van am ((thuc va) or (thuc dan)) dan via cua tre*.