Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
vat hanh » vat thanh, van hanh, va hanh
hanh tai » thanh tai, hang tai, han tai
su sach » so sach, vu sach
hang xa » hoang xa, hang va, lang xa
hang ca » hang va, nang cao, hang tai
hieu va » lieu va, hieu qua
tai cuu » tai cuc, tai buu, tai cua
cuu tre » cua tre, cau tren, cau treo

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 ((hang xa) or (hang ca)) hoi. hieu va cac thuc vat hanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((hang xa) OR (hang ca)) hoi. hieu va cac thuc vat hanh tai cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach y ((hang xa) or (hang ca)) hoi. hieu va cac thuc vat hanh tai cuu tre*.