Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nang van » dang van, tang van, lang van
sach ky » sac ky, sach y, sach ty
van hoi » van hoa, van hoc, van hoe
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
va hanh » van hanh, va thanh, va danh
de cua » le cua, dieu cua
te cua » tue cua, le 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 duc va hanh ((de cua) OR (te cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang van hoi. hieu va pham duc va hanh ((de cua) OR (te cua)) tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang van hoi. hieu va pham duc va hanh ((de cua) OR (te cua)) tre*.