Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hanh vai » hanh vi, hanh va, hanh tai
so sanh » do sanh
nang ho » nang hoc, nang co, tang ho
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
nang o » nang co, nang ro, nang x
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: ((hoc sach) or (so sanh)) ky ((nang o) OR (nang ho)) hoi. hieu ve pham duc va hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (so sanh)) ky ((nang o) OR (nang ho)) hoi. hieu ve pham duc va hanh vai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) or (so sanh)) ky ((nang o) OR (nang ho)) hoi. hieu ve pham duc va hanh vai cua te*".