Perhaps you should try some spelling variations:
chat hoc » chat thom, cho hoc, vat hoc
chat hoa » thuat hoa, chat va, chat huu
hieu van » hieu va, thien van, lieu va
van phan » van phong, van thanh, luan phan
phan duc » pham duc, phan tu, phan dau
hanh vai » hanh vi, hanh va, hanh tai
te sach » toc sach
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai 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: te sach ky nang ((chat hoc) OR (chat hoa)). hieu van phan duc va hanh vai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((chat hoc) OR (chat hoa)). hieu van phan duc va hanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((chat hoc) OR (chat hoa)). hieu van phan duc va hanh vai cua te*.