Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nang van » dang van, tang van, lang van
van pham » san pham, van phan, van phat
va thanh » gia thanh, ban thanh, va tinh
sach ky » sac ky, sach y, sach ty
van hoi » van hoa, van hoc, van hoe
va pham » va phat, va phap, va phan
va hanh » van hanh, va danh, ban hanh
cua tre » cua te, cuu tre, cua triet
de cua » le cua, te cua, dieu cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang van hoi. hieu ((va pham) or (van pham)) duc ((va hanh) OR (va thanh)) de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang van hoi. hieu ((va pham) OR (van pham)) duc ((va hanh) OR (va thanh)) de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang van hoi. hieu ((va pham) or (van pham)) duc ((va hanh) OR (va thanh)) de cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang van hoi. hieu ((va pham) or (van pham)) duc ((va hanh) OR (va thanh)) de cua tre*.