Perhaps you should try some spelling variations:
danh hai » dang hai, lanh hai, manh hai
thuc day » thuc dan, thuc vat
thuc va » thuc vat, thuc dan
sach ly » sach y, sach lo, sach ty
su sach » so sach, vu sach
ly nang » ky nang, ly hang, ly vang
cu tren » tu tren, dua tren
va cam » va cham, va cac, va cao
ma hoi » mai hoi, ma hoa, me hoi
hai cu » hai cua, hai chu, hai cuc

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ly nang ((ma hoi) or (xa hoi)). lieu va cam ((thuc va) or (thuc day)) danh hai cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang ((ma hoi) OR (xa hoi)). lieu va cam ((thuc va) OR (thuc day)) danh hai cu tren.
• Adding a wildcard symbol may retrieve word variants: su sach ly nang ((ma hoi) or (xa hoi)). lieu va cam ((thuc va) or (thuc day)) danh hai cu tren*.