Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
thanh vai » thanh van, thanh tai, thanh oai
vu khach » vu khanh, vu khac, vay khach
hieu van » hieu va, thien van, lieu va
vu sach » vu bach, su sach
van cam » van nam, van lam, van cau
qua ban » cua ban, qua quan
cam qua » cau qua, cac qua, cay qua
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) OR (vu khach)) ky nang ma hoi. hieu van cam qua ban ((thanh vai) or (thanh hai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) ky nang ma hoi. hieu van cam qua ban ((thanh vai) OR (thanh hai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (vu khach)) ky nang ma hoi. hieu van cam qua ban ((thanh vai) or (thanh hai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (vu khach)) ky nang ma hoi. hieu van cam qua ban ((thanh vai) or (thanh hai)) cua tre*.