Perhaps you should try some spelling variations:
tru nang » tra nang, tri nang, truc nano
hieu van » hieu va, thien van, lieu va
ban hang » ngan hang
tu sach » thu sach, su sach, te sach
van cam » van nam, van lam, van cau
cam cua » ca cua, nam cua, cau cua
hang di » hang doi, hang vi, hang dien
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de 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 ((tru nang) or (ky nang)) xa hoi. hieu van cam cua ban hang di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tru nang) OR (ky nang)) xa hoi. hieu van cam cua ban hang di cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ((tru nang) or (ky nang)) xa hoi. hieu van cam cua ban hang di cua tre*.