Perhaps you should try some spelling variations:
cach tru » cach tu, cac tru, cach thuc
tru nang » tra nang, tri nang, truc nano
hieu van » hieu va, thien van, lieu va
van nham » van nam, van nhan, van tham
thuc dan » hoc dan, thuc vat
thanh vi » hanh vi, thanh va, thanh ve
so cach » so sach, co cach, loi cach
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so cach tru nang ma hoi. hieu van nham ((thuc dan) or (thuc hanh)) thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so cach tru nang ma hoi. hieu van nham ((thuc dan) OR (thuc hanh)) thanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: so cach tru nang ma hoi. hieu van nham ((thuc dan) or (thuc hanh)) thanh vi cua tre*.