Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
va trong » va truong, va thong, va tuong
so sanh » do sanh
ty nang » ky nang, ty hang, ty nong
ly nang » ky nang, ly hang, ly vang
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh ((((ty nang) OR (ly nang))) or (ty xang)) xa hoi. hieu ve cam thuc va trong doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ((((ty nang) OR (ly nang))) OR (ty xang)) xa hoi. hieu ve cam thuc va trong doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh ((((ty nang) OR (ly nang))) or (ty xang)) xa hoi. hieu ve cam thuc va trong doi cua tre".
• Adding a wildcard symbol may retrieve word variants: so sanh ((((ty nang) OR (ly nang))) or (ty xang)) xa hoi. hieu ve cam thuc va trong doi cua tre*.