Perhaps you should try some spelling variations:
thien van » thi van
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
cac duc » cao duc, cac dac, cac nuoc
cua cu » cua chu, cua cau, cua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang xa hoi. thien van ((cac duc) OR (cac du)) van hanh vi ((cua cu) or (qua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang xa hoi. thien van ((cac duc) OR (cac du)) van hanh vi ((cua cu) OR (qua su)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang xa hoi. thien van ((cac duc) OR (cac du)) van hanh vi ((cua cu) or (qua su))".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang xa hoi. thien van ((cac duc) OR (cac du)) van hanh vi ((cua cu) or (qua su))*.