Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
vat hanh » vat thanh, van hanh, va hanh
vu sach » vu bach, vu khach
su sach » so sach
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
hieu va » lieu va, hieu qua
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (su sach)) ky lang ha noi. hieu va cac thuc vat hanh vi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) ky lang ha noi. hieu va cac thuc vat hanh vi ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (su sach)) ky lang ha noi. hieu va cac thuc vat hanh vi ((cua tre) or (cua te))*.