Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
tuan tai » toan tai, quan tai, tan tai
tuan dai » toan dai, quang dai, tuan dang
duc van » duc va, duc tan, duc manh
tu sang » thu sang, tu san, tu quang
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
tu lang » cu lang, tu lanh, xu lang
ca duc » cao duc, cua duc, ca dua
qua ca » qua cac, qua cua, qua cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sang) or (tu lang)) ky lang xa hoi. hieu qua ca duc van ((tuan dai) OR (tuan tai)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sang) OR (tu lang)) ky lang xa hoi. hieu qua ca duc van ((tuan dai) OR (tuan tai)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sang) or (tu lang)) ky lang xa hoi. hieu qua ca duc van ((tuan dai) OR (tuan tai)) cua viet".
• Adding a wildcard symbol may retrieve word variants: ((tu sang) or (tu lang)) ky lang xa hoi. hieu qua ca duc van ((tuan dai) OR (tuan tai)) cua viet*.