Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hang tai » hang va, dung tai
hanh tai » thanh tai, han tai, hinh tai
cham tuc » nham thuc, pham thuc, tham thuc
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
san ky » sang ky, van ky, dan ky
tuc va » thuc va, truc va, tuc xa
tu san » thu san, tu ban, tu can

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky ((sang tao) or (nang ma)) hoi. hieu ve cham tuc va ((hanh tai) OR (hang tai)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky ((sang tao) OR (nang ma)) hoi. hieu ve cham tuc va ((hanh tai) OR (hang tai)) cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky ((sang tao) or (nang ma)) hoi. hieu ve cham tuc va ((hanh tai) OR (hang tai)) cau tren".
• Adding a wildcard symbol may retrieve word variants: tu san ky ((sang tao) or (nang ma)) hoi. hieu ve cham tuc va ((hanh tai) OR (hang tai)) cau tren*.