Perhaps you should try some spelling variations:
dieu kien » dieu khien, dien bien
dieu hien » dieu khien, bieu hien, dien bien
cac loai » cac bai, cac giai, cac dai
dinh vai » dinh van, dinh vi, dinh va
vai cua » dai cua, hai cua, lai cua
va dinh » van dinh, va kinh, va tinh
tu sach » thu sach, su sach, te sach
cac lao » ca lao, cac giao, cac lang
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
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 ty nang xa hoi. ((dieu hien) OR (dieu kien)) ((cac lao) or (cac loai)) va dinh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. ((dieu hien) OR (dieu kien)) ((cac lao) OR (cac loai)) va dinh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. ((dieu hien) OR (dieu kien)) ((cac lao) or (cac loai)) va dinh vai cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. ((dieu hien) OR (dieu kien)) ((cac lao) or (cac loai)) va dinh vai cua te*.