Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
cam thuc » am thuc, nam thuc, cam thu
cau treo » cau theo, cau triet, cau trieu
hanh hai » thanh hai, nhanh hai, hang hai
hieu van » hieu va, thien van, lieu va
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
so sinh » so tinh, cho sinh, hoa sinh
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
so sanh » do sanh
van cam » van nam, van lam, van cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sinh) or (so sanh)) ly nang ma hoa. hieu van cam thuc va hanh hai ((cau treo) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sinh) OR (so sanh)) ly nang ma hoa. hieu van cam thuc va hanh hai ((cau treo) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: ((so sinh) or (so sanh)) ly nang ma hoa. hieu van cam thuc va hanh hai ((cau treo) or (cau tren))*.