Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
nam qua » nam quan, nam cua, nam mua
qua ban » cua ban, qua quan
van cua » vang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang

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 y nang ((xa hoi) or (ma hoa)). hieu van nam qua ban thanh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((xa hoi) OR (ma hoa)). hieu van nam qua ban thanh van cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((xa hoi) or (ma hoa)). hieu van nam qua ban thanh van cua tre*.