Perhaps you should try some spelling variations:
cau thuc » cau truc, cuu thuc, can thuc
trinh do » trinh ky
thuc va » thuc vat, thuc dan, thuc day
tinh di » tinh doi, trinh di, tinh da
su sach » so sach, vu sach
hieu ve » hieu van
hieu va » lieu va, hieu qua
cao hoa » cao hoat, cao khoa, cau hoa
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang

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 y nang cao hoa. ((hieu ve) or (hieu va)) cau thuc va ((tinh di) or (trinh do)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang cao hoa. ((hieu ve) OR (hieu va)) cau thuc va ((tinh di) OR (trinh do)) cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach y nang cao hoa. ((hieu ve) or (hieu va)) cau thuc va ((tinh di) or (trinh do)) cua tre*.