Perhaps you should try some spelling variations:
doc thuc » hoc thuc, do thuc, hoc thuoc
cua tre » cua te, cuu tre, cua triet
coc tuc » coc luc, hoc thuc, hoc truc
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
di cua » dai cua, doi cua, de cua
tu san » thu san, tu ban, vu san
ha hoi » hoa hoi, ha noi, xa hoi
tu can » tu ban, tu cac, thu canh

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu san) or (tu can)) ky lang ha hoi. lieu va ((coc tuc) OR (doc thuc)) va hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu san) OR (tu can)) ky lang ha hoi. lieu va ((coc tuc) OR (doc thuc)) va hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu san) or (tu can)) ky lang ha hoi. lieu va ((coc tuc) OR (doc thuc)) va hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu san) or (tu can)) ky lang ha hoi. lieu va ((coc tuc) OR (doc thuc)) va hanh di cua tre*.