Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
van hanh » van thanh, ban hanh, van ban
vien cam » vien cac, vien cao, vien nam
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
ly nang » ky nang, ly hang, ly vang
nang xa » nang x, lang xa, nang ma
van anh » van thanh, tuan anh, van minh
doi cua » dai cua, hoi 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: ((toc sach) or (doc sach)) ly nang xa hoi. hieu vien cam xuc ((van hanh) OR (van anh)) doi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) ly nang xa hoi. hieu vien cam xuc ((van hanh) OR (van anh)) doi cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (doc sach)) ly nang xa hoi. hieu vien cam xuc ((van hanh) OR (van anh)) doi cua tu".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (doc sach)) ly nang xa hoi. hieu vien cam xuc ((van hanh) OR (van anh)) doi cua tu*.