Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
phu san » phi san, thuy san
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu van
hieu va » lieu va, hieu qua
san ky » sang ky, van ky, dan ky
dau va » dau ve, lau va
cua cu » cua chu, cua cau, cua su
du va » tu va, su va, vu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: phu san ky lang xa hoi. ((hieu ve) or (hieu va)) cac ((du va) OR (dau va)) thanh dai cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: phu san ky lang xa hoi. ((hieu ve) OR (hieu va)) cac ((du va) OR (dau va)) thanh dai cua cu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "phu san ky lang xa hoi. ((hieu ve) or (hieu va)) cac ((du va) OR (dau va)) thanh dai cua cu".
• Adding a wildcard symbol may retrieve word variants: phu san ky lang xa hoi. ((hieu ve) or (hieu va)) cac ((du va) OR (dau va)) thanh dai cua cu*.