Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
dua tren » dung tren
thanh vi » hanh vi, thanh va, thanh ve
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cam luc » cam xuc, cau luc
luc van » luoc van, luu van, duc van
va cam » va cham, va cac, va cao
cat ky » cao ky, cac ky, cat k
cam ky » cao ky, cac ky
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: thuat ((cat ky) OR (cam ky)) nang xa hoi. hieu va cam luc van thanh vi ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((cat ky) OR (cam ky)) nang xa hoi. hieu va cam luc van thanh vi ((dua tren) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((cat ky) OR (cam ky)) nang xa hoi. hieu va cam luc van thanh vi ((dua tren) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: thuat ((cat ky) OR (cam ky)) nang xa hoi. hieu va cam luc van thanh vi ((dua tren) or (cua te))*.