Perhaps you should try some spelling variations:
thuat lanh » thuat lap, thuat san
cam thuc » am thuc, nam thuc, cam thu
vat hanh » vat thanh, van hanh, va hanh
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
ve cam » ve cham, ve cac, va cam
vi cuu » vi luu, vinh cuu
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thuat lanh)) ky nang ((x hoi) or (o hoi)). hieu ve cam thuc vat hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat lanh)) ky nang ((x hoi) OR (o hoi)). hieu ve cam thuc vat hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat lanh)) ky nang ((x hoi) or (o hoi)). hieu ve cam thuc vat hanh vi cuu tre*.