Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
sang tao » hang tai
doan tai » doanh tai, toan tai, doan thi
tuc giai » thuc giai, tac giai, tuc gia
cham tuc » nham thuc, pham thuc, tham thuc
hieu va » lieu va, hieu qua
tai dau » tac dau, tai du, thi dau
hieu ve » hieu van
nang ma » tang ma, sang ma, nang cao
dan ky » van ky
tu dan » tuc dan, tu ban, cu dan

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu dan ky ((sang tao) or (nang ma)) hoi. ((hieu ve) or (hieu va)) cham tuc giai doan tai dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu dan ky ((sang tao) OR (nang ma)) hoi. ((hieu ve) OR (hieu va)) cham tuc giai doan tai dau tren.
• Adding a wildcard symbol may retrieve word variants: tu dan ky ((sang tao) or (nang ma)) hoi. ((hieu ve) or (hieu va)) cham tuc giai doan tai dau tren*.