Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
may nang » may nong, ky nang, cam nang
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
cam tuc » cam tu, nam thuc, dam thuc
tu sach » thu sach, su sach, te sach
va nang » van nang, da nang, cam nang
di cua » dai cua, doi cua, de cua
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: tu sach ((may nang) or (va nang)) xa hoi. hieu vien ((cam tuc) OR (cam xuc)) va hanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((may nang) OR (va nang)) xa hoi. hieu vien ((cam tuc) OR (cam xuc)) va hanh di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((may nang) or (va nang)) xa hoi. hieu vien ((cam tuc) OR (cam xuc)) va hanh di cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ((may nang) or (va nang)) xa hoi. hieu vien ((cam tuc) OR (cam xuc)) va hanh di cua te*.