Perhaps you should try some spelling variations:
sang tai » hang tai, sang than, dung tai
tang tai » hang tai, dung tai, dong tai
sang tao » hang tai
sach vu » sach va, sach tu, sach uu
tu sach » thu sach, su sach, te sach
cac duc » cac du, cao duc, cac dac
hieu va » lieu va, hieu qua
cao hoi » cau hoi, co hoi, cao hoc
vu nang » vuc nang, va nang, vu dang
cuu tre » cua tre, cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach vu nang cao hoi. hieu va cac duc va ((((sang tai) or (sang tao))) or (tang tai)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach vu nang cao hoi. hieu va cac duc va ((((sang tai) OR (sang tao))) OR (tang tai)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach vu nang cao hoi. hieu va cac duc va ((((sang tai) or (sang tao))) or (tang tai)) cuu tre*.