Perhaps you should try some spelling variations:
van thanh » van tuan
ban thanh » ban hanh, ban hang
hieu vien » hieu hien, hieu viec, lieu vien
cach thuc » anh thuc
vien da » vien dai, hien dai
lang xa » lang ha, dang xay, lang van
cac thu » cac thoi
da duc » dao duc, da duoc, do duc
ha cua » hoa cua, hai cua, nha cua
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((cach thuc) or (cac thu)) lang xa hoi. hieu vien da duc ((van thanh) OR (ban thanh)) ha cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((cach thuc) OR (cac thu)) lang xa hoi. hieu vien da duc ((van thanh) OR (ban thanh)) ha cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((cach thuc) or (cac thu)) lang xa hoi. hieu vien da duc ((van thanh) OR (ban thanh)) ha cua tu".
• Adding a wildcard symbol may retrieve word variants: thu ((cach thuc) or (cac thu)) lang xa hoi. hieu vien da duc ((van thanh) OR (ban thanh)) ha cua tu*.