Perhaps you should try some spelling variations:
sang tao » hang tai
cau tren » cu tren, dau tren, cau treo
hanh tai » thanh tai, hang tai, han tai
ca tren » cu tren, la tren, co tren
va hanh » van hanh, va thanh, va danh
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
tu san » thu san, tu ban, tu can
tuc va » thuc va, truc va, tuc xa
san ky » sang ky, van ky, dan ky
va cam » va cham, va cac, va cao

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 va cam tuc va hanh tai ((cau tren) or (ca tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky ((sang tao) OR (nang ma)) hoi. hieu va cam tuc va hanh tai ((cau tren) OR (ca tren)).
• Adding a wildcard symbol may retrieve word variants: tu san ky ((sang tao) or (nang ma)) hoi. hieu va cam tuc va hanh tai ((cau tren) or (ca tren))*.