Perhaps you should try some spelling variations:
trien viet » tieng viet
hieu viec » nhieu viec, hieu ve, sieu viet
dan trinh » dan tinh, van trinh, hanh trinh
trinh van » trinh han, trinh quan, trinh toan
cam thuc » am thuc, nam thuc, cam thu
thuc dan » thuc hanh, hoc dan, thuc vat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van cua » vang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet

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 ky nang xa hoi. ((hieu viec) or (trien viet)) cam thuc dan trinh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. ((hieu viec) OR (trien viet)) cam thuc dan trinh van cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. ((hieu viec) or (trien viet)) cam thuc dan trinh van cua tre*.