Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh va » thanh van, hanh va, thanh ha
kham vuc » kham cuoc, khu vuc
san kho » san khoa, lan kho, san ho
pham vu » pham tu, pham va, pham vi
hieu va » lieu va, hieu qua
may noi » hay noi, may nong, mang noi
san cho » sang cho, san chi, san co
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((san kho) or (san cho)) mang may noi. hieu va ((kham vuc) OR (pham vu)) van thanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((san kho) OR (san cho)) mang may noi. hieu va ((kham vuc) OR (pham vu)) van thanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((san kho) or (san cho)) mang may noi. hieu va ((kham vuc) OR (pham vu)) van thanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((san kho) or (san cho)) mang may noi. hieu va ((kham vuc) OR (pham vu)) van thanh va cua tre*.