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