Perhaps you should try some spelling variations:
thanh lay » thanh lap, thanh tay, thanh lam
dan thanh » dang thanh, danh thanh, ban thanh
cua triet » cua viet, su triet, va triet
thuc dan » thuc hanh, hoc dan, thuc vat
nam thuc » nam thuoc, am thuc, nam thu
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, dua tren
bach v » bach van
v nang » va nang, vu nang, van nang
ve nam » he nam, va nam, le nam
x hoi » xa hoi, o hoi, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu bach v nang ((x hoi) or (x ho)). hieu ve nam thuc dan thanh lay ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu bach v nang ((x hoi) OR (x ho)). hieu ve nam thuc dan thanh lay ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: vu bach v nang ((x hoi) or (x ho)). hieu ve nam thuc dan thanh lay ((cua tre) or (cua triet))*.