Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
tien cua » trien cua, tiep cua, dien cua
vien cua » viec cua, dien cua, bien cua
va tinh » may tinh
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » hieu qua
nam xua » nam cua, nam mua, nam qua
tu sac » tu sach, tu cac, tu san
xua va » xuat va, vua va, sua va
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang mai hoi. ((lieu va) or (hieu va)) nam xua va tinh ((vien cua) OR (tien cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang mai hoi. ((lieu va) OR (hieu va)) nam xua va tinh ((vien cua) OR (tien cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang mai hoi. ((lieu va) or (hieu va)) nam xua va tinh ((vien cua) OR (tien cua)) triet".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang mai hoi. ((lieu va) or (hieu va)) nam xua va tinh ((vien cua) OR (tien cua)) triet*.