Perhaps you should try some spelling variations:
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
vu san » vu ban
va san » va ban
ma hoi » mai hoi, xa hoi, me hoi
ve dat » de dat, va dat, ve dao
vi cuu » vi luu, vinh cuu
nuoc » quoc, duoc, ngoc

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

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