Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
van hanh » ban hanh, van anh, van ban
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
tu sac » tu sach, tu san, tu bac
ve hoc » te hoc, va hoc, vi hoc
va cuu » va cau, va chu, va huu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sac) or (tu cac)) ky nang xa hoi. hieu ve hoc nuoc ((van hanh) OR (van thanh)) va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu cac)) ky nang xa hoi. hieu ve hoc nuoc ((van hanh) OR (van thanh)) va cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sac) or (tu cac)) ky nang xa hoi. hieu ve hoc nuoc ((van hanh) OR (van thanh)) va cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (tu cac)) ky nang xa hoi. hieu ve hoc nuoc ((van hanh) OR (van thanh)) va cuu tre*.