Perhaps you should try some spelling variations:
phan tien » phan kien, phan bien, phap tieng
thu sach » tu sach, thuat sach, thuoc sach
sach ky » sac ky, sach y, sach ty
va phan » van phan, va phat, va phap
va cao » va co, va dao, va bao
suc va » duc va, tuc va, luc va
cua tu » cua tuc, cua su, cua cu
x hoi » xa hoi, o hoi, x ho

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 x hoi. hieu ((va cao) OR (va cac)) suc va phan tien ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x hoi. hieu ((va cao) OR (va cac)) suc va phan tien ((cua te) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x hoi. hieu ((va cao) OR (va cac)) suc va phan tien ((cua te) or (cua tu))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. hieu ((va cao) OR (va cac)) suc va phan tien ((cua te) or (cua tu))*.