Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh hai
hieu van » hieu va, thien van, lieu va
tru nang » tra nang, tri nang, truc nano
lap cua » lai cua, tap cua, lam cua
van cam » van nam, van lam, van cau
su sach » so sach, vu sach
tu nang » tu nong, tu nano, tu lang
cua tre » cua te, cuu tre, cua triet
co loi » co hoi
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((tu nang) OR (tru nang)) co loi. hieu van cam ((xuc va) or (tuc xa)) thanh lap cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((tu nang) OR (tru nang)) co loi. hieu van cam ((xuc va) OR (tuc xa)) thanh lap cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((tu nang) OR (tru nang)) co loi. hieu van cam ((xuc va) or (tuc xa)) thanh lap cua tre*".