Perhaps you should try some spelling variations:
thien van » thi van
tham thuc » nham thuc, pham thuc, tam thuc
van tham » van thanh, van tuan, van chat
vat hanh » vat thanh, van hanh, va hanh
te sach » toc sach
vai cua » dai cua, hai cua, lai cua
te ban » te bao
vi cua » di cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (te ban)) ky nang x hoi. thien van tham thuc vat hanh ((vi cua) or (vai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (te ban)) ky nang x hoi. thien van tham thuc vat hanh ((vi cua) OR (vai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (te ban)) ky nang x hoi. thien van tham thuc vat hanh ((vi cua) or (vai cua)) tre*.