Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
chet duoc » che duoc, cho duoc, che quoc
duoc van » duoc va, duc van, duoc ban
ve chet » ve chat, ve che, se chet
bai cua » ban cua, bai ca, hai cua
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
sac ky » cac ky, sai ky
tu sac » tu sach, tu cac, tu san

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 xa) OR (nang ma)) hoi. hieu ve chet duoc van thanh ((bai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang xa) OR (nang ma)) hoi. hieu ve chet duoc van thanh ((bai cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((nang xa) OR (nang ma)) hoi. hieu ve chet duoc van thanh ((bai cua) or (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang xa) OR (nang ma)) hoi. hieu ve chet duoc van thanh ((bai cua) or (dai cua)) tre*.