Perhaps you should try some spelling variations:
day hanh » day nhanh, day thanh, dao hanh
thuc day » thuc dan, thuc vat
tu sach » thu sach, te sach, tu cach
ve phan » va phan, ke phan, ve phat
hanh di » hanh vi, hanh de, hang di
ve pham » vi pham, v pham, ve phat
cao hoi » cau hoi, co hoi, cao hoc
su sach » so sach, vu sach
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) or (su sach)) ky nang cao hoi. hieu ((ve pham) OR (ve phan)) thuc day hanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang cao hoi. hieu ((ve pham) OR (ve phan)) thuc day hanh di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang cao hoi. hieu ((ve pham) OR (ve phan)) thuc day hanh di cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang cao hoi. hieu ((ve pham) OR (ve phan)) thuc day hanh di cua te*.