Perhaps you should try some spelling variations:
nang tai » hang tai, sang tai, nang cao
tang tai » hang tai, dung tai, dong tai
sang tao » hang tai
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
cac tuc » cac toc, cac tu, cac tac
ve cac » va cac, vien cac
tuc va » thuc va, truc va, tuc xa
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 tuc va ((nang tai) OR (tang 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 tuc va ((nang tai) OR (tang tai)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang ma) or (sang tao)) hoi. hieu ve cac tuc va ((nang tai) OR (tang tai)) cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang ma) or (sang tao)) hoi. hieu ve cac tuc va ((nang tai) OR (tang tai)) cua te*.