Perhaps you should try some spelling variations:
kham duc » pham duc, kham cuoc, pham duy
xang van » tang van, lang van, nang van
dang van » hoang van, hang va
su cach » su sach, tu cach, su cac
cua tre » cua te, cua triet, dua tren
duc gia » quoc gia
hieu vu » hieu va, hieu ve, hieu su
vu kham » vu khanh
cach tu » cach thuc
cuu tre » cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: su cach tu ((xang van) OR (dang van)) hoi. hieu vu kham duc gia thanh san ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cach tu ((xang van) OR (dang van)) hoi. hieu vu kham duc gia thanh san ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su cach tu ((xang van) OR (dang van)) hoi. hieu vu kham duc gia thanh san ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: su cach tu ((xang van) OR (dang van)) hoi. hieu vu kham duc gia thanh san ((cua tre) or (cuu tre))*.