Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
thai cua » than cua, tai cuc, dai cua
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
va hanh » van hanh, va thanh, va danh
nam tu » nam thu, nam thuc

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 dang xa hoi. hieu van ((nam tu) or (nam thuoc)) va hanh ((thai cua) OR (tri cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky dang xa hoi. hieu van ((nam tu) OR (nam thuoc)) va hanh ((thai cua) OR (tri cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky dang xa hoi. hieu van ((nam tu) or (nam thuoc)) va hanh ((thai cua) OR (tri cua)) te".
• Adding a wildcard symbol may retrieve word variants: toc sach ky dang xa hoi. hieu van ((nam tu) or (nam thuoc)) va hanh ((thai cua) OR (tri cua)) te*.