Perhaps you should try some spelling variations:
phan tien » phan kien, phan bien, phap tieng
cao suc » cao su, cao duc
va phan » van phan, va phat, va phap
hieu ve » hieu va, hieu van
sach ky » sach y, sach ty, sach kem
suc va » duc va, tuc va, luc va
ve cao » va cao, ve bao, ve cac
nang o » nang co, nang ho, nang ro
sac ky » cac ky, sai ky
cua tu » cua tuc, cua su, cua cu
o hoi » co hoi, o hoc, o hai

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) OR (sac ky)) nang o hoi. hieu ve cao 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) OR (sac ky)) nang o hoi. hieu ve cao 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) OR (sac ky)) nang o hoi. hieu ve cao suc va phan tien ((cua te) or (cua tu))".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) OR (sac ky)) nang o hoi. hieu ve cao suc va phan tien ((cua te) or (cua tu))*.