Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
hay lang » ha lang, tay lang, nhan lang
sach hay » sach han, sach ha, sach nay
so sach » so sanh, bo sach, co sach
lang xa » lang ha, dang xay, lang van
hieu ve » hieu van
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc day
vi cua » vai cua, di cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach hay lang xa hoi. ((hieu ve) or (hieu va)) cau ((thuc va) or (thuc dan)) hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach hay lang xa hoi. ((hieu ve) OR (hieu va)) cau ((thuc va) OR (thuc dan)) hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: so sach hay lang xa hoi. ((hieu ve) or (hieu va)) cau ((thuc va) or (thuc dan)) hanh vi cua te*.