Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
vo tuan » vo xuan, do tuan, va tuan
anh via » anh va, anh bia, anh viet
ve cac » vien cac
cua tu » cua tuc, cua cu, cua te
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang xa hoi. hieu ((ve cac) or (va cac)) vo tuan anh via ((cua tu) OR (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hieu ((ve cac) OR (va cac)) vo tuan anh via ((cua tu) OR (cua su)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang xa hoi. hieu ((ve cac) or (va cac)) vo tuan anh via ((cua tu) OR (cua su))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu ((ve cac) or (va cac)) vo tuan anh via ((cua tu) OR (cua su))*.