Perhaps you should try some spelling variations:
sang tao » hang tai
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
su sach » so sach, vu sach
cac dac » cac dan, cac dai, cac bac
nang ma » tang ma, sang ma, nang cao
tai cua » thai cua, tai cuc, tri cua
va dung » van dung, va duong, vat dung
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky ((nang ma) or (sang tao)) hoi. hieu ve ((cac nuoc) or (cac dac)) va dung tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang ma) OR (sang tao)) hoi. hieu ve ((cac nuoc) OR (cac dac)) va dung tai cua te.
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang ma) or (sang tao)) hoi. hieu ve ((cac nuoc) or (cac dac)) va dung tai cua te*.