Perhaps you should try some spelling variations:
cham san » pham san, nham san, chuan san
hieu va » lieu va
san van » tan van, luan van, tran van
minh ve » dinh ve, minh va, kinh ve
cuu tre » cua tre, cau tren, cau treo
tu van » tu va
ma hoi » mai hoi, ma hoa, me hoi
ve cuu » ve cau, ve chu, ve cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu van ky nang ((ma hoi) OR (xa hoi)). ((hieu va) or (hieu qua)) cham san van minh ve cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu van ky nang ((ma hoi) OR (xa hoi)). ((hieu va) OR (hieu qua)) cham san van minh ve cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu van ky nang ((ma hoi) OR (xa hoi)). ((hieu va) or (hieu qua)) cham san van minh ve cuu tre*".