Perhaps you should try some spelling variations:
phap vien » phap viet, phap bien, phap dien
vien cua » viec cua, dien cua, tien cua
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
sac ky » cac ky
ve cao » va cao, ve bao, ve cac
suc va » tuc va, luc va, soc va
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sac ky) or (sai ky)) lang xa hoi. hieu ve cao ((suc va) OR (duc va)) phap vien cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sac ky) OR (sai ky)) lang xa hoi. hieu ve cao ((suc va) OR (duc va)) phap vien cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sac ky) or (sai ky)) lang xa hoi. hieu ve cao ((suc va) OR (duc va)) phap vien cua te".
• Adding a wildcard symbol may retrieve word variants: thu ((sac ky) or (sai ky)) lang xa hoi. hieu ve cao ((suc va) OR (duc va)) phap vien cua te*.