Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
cao tren » ca tren, cau tren, co tren
cao hoc » co hoc, cho hoc, chat hoc
lieu ha » lieu nha, lieu va, liem ha
thuc va » thuc dan, thuc day
tai cao » thai cao, tao cao, tai sao
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang ((cao hoc) or (cau hoi)). lieu ha nam ((thuc va) OR (thuc vat)) hanh tai cao tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ((cao hoc) OR (cau hoi)). lieu ha nam ((thuc va) OR (thuc vat)) hanh tai cao tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang ((cao hoc) or (cau hoi)). lieu ha nam ((thuc va) OR (thuc vat)) hanh tai cao tren".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((cao hoc) or (cau hoi)). lieu ha nam ((thuc va) OR (thuc vat)) hanh tai cao tren*.