Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
vien cac » vien bach, vien dai, vien da
cuc tre » duc tre, cua tre, cuu tre
dac van » cac van, dao van, dam van
cac dac » cac dan, cac dai, cac bac
thu san » thuy san, thu ban, phu san
nang ho » nang hoc, nang co, tang ho
tu sac » tu sach, tu cac, tu bac
tu san » tu ban, tu can, vu san
ho lai » o lai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((tu sac) or (tu san))) or (thu san)) ky nang ho lai. hieu vien cac dac van hanh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sac) OR (tu san))) OR (thu san)) ky nang ho lai. hieu vien cac dac van hanh tai cuc tre.
• Adding a wildcard symbol may retrieve word variants: ((((tu sac) or (tu san))) or (thu san)) ky nang ho lai. hieu vien cac dac van hanh tai cuc tre*.