Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
sach thu » sach thue, sach thieu, sach tham
thuc van » thuc vat, thuc dan, thuc va
cu tren » tu tren, dua tren
sach ty » sach y, sach tu, xach tay
va dao » ca dao
tai cu » tai cuc, tai cua, tai co
x hoi » xa hoi, o hoi, x ho

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 ty) or (sach thu)) nang x hoi. lieu ((va dau) or (va dao)) thuc van hanh tai cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach thu)) nang x hoi. lieu ((va dau) OR (va dao)) thuc van hanh tai cu tren.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach thu)) nang x hoi. lieu ((va dau) or (va dao)) thuc van hanh tai cu tren*.