Perhaps you should try some spelling variations:
cach phan » cach pha, mach phan, cac phan
hoc tcong » hoc cong, hoc trong, hoc thong
tcong tac » tuong tac, trong tac, cong tan
sach cha » sach nha, sach che, sach ha
ve nguon » va nguoi, ve nuoc, le nguoi
ve nguoi » va nguoi, le nguoi, ke nguoi
cong tac » cong ty
giai hoc » dai hoc, bai hoc, thai hoc
tu cach » tu cac
me giai » de giai, ve giai, ke giai
co cong » cao cong, cho cong, bo cong
tu sach » thu sach, su sach, te sach

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 cha me giai hoc tcong tac ) or ( tu cach phan ((ve nguoi) or (ve nguon)) co cong tac ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach cha me giai hoc tcong tac ) OR ( tu cach phan ((ve nguoi) OR (ve nguon)) co cong tac )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach cha me giai hoc tcong tac ) or ( tu cach phan ((ve nguoi) or (ve nguon)) co cong tac ))*.