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