Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
tru nang » tra nang, tri nang, truc nano
van cam » van nam, van lam, van cau
duc ban » duc van, dua ban, duc man
tu sach » thu sach, su sach, te sach
tu nong » tu dong, tu cong, tu tong
cua tre » cua te, cuu tre, cua triet
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: tu sach ((tu nong) or (tru nang)) xa hoi. hieu van cam ((duc ban) OR (duc tan)) thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tu nong) OR (tru nang)) xa hoi. hieu van cam ((duc ban) OR (duc tan)) thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tu nong) or (tru nang)) xa hoi. hieu van cam ((duc ban) OR (duc tan)) thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((tu nong) or (tru nang)) xa hoi. hieu van cam ((duc ban) OR (duc tan)) thanh vi cua tre*.