Perhaps you should try some spelling variations:
hang doi » hang di, hang loi, huong doi
sang tao » hang tai
cu tren » tu tren, dua tren
cam tuc » cam xuc, cam tu, nam thuc
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va
va hang » van hang, va nang, va lang
doi cu » doi cua, doi co, doi ca
tuc va » thuc va, truc va, tuc xa
tu sac » tu sach, tu cac, tu san
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 ma) or (sang tao)) hoi. ((hieu va) OR (hieu qua)) cam tuc va hang doi cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang ma) OR (sang tao)) hoi. ((hieu va) OR (hieu qua)) cam tuc va hang doi cu tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((nang ma) or (sang tao)) hoi. ((hieu va) OR (hieu qua)) cam tuc va hang doi cu tren*".