Perhaps you should try some spelling variations:
tieu vien » tieu tien, tieu dien, tieu viet
vien cac » vien bach, vien dai, vien da
hang tai » hang va, dung tai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
su viet » so viet
xuc va » tuc va, luc va, xac va
thiet » thieu

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 ky nang xa hoi. tieu vien cac ((xuc va) or (duc va)) hang tai ((su viet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. tieu vien cac ((xuc va) OR (duc va)) hang tai ((su viet) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. tieu vien cac ((xuc va) or (duc va)) hang tai ((su viet) or (va thiet))*.