Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
khien cua » khien qua, khien tu, khi cua
trien cua » truyen cua, trien nha, tri cua
doc sach » hoc sach, toc sach, nuoc sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach ky nang x hoi. hieu va tham thuc va danh ((khien cua) OR (trien cua)) te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ky nang x hoi. hieu va tham thuc va danh ((khien cua) OR (trien cua)) te".
• Adding a wildcard symbol may retrieve word variants: doc sach ky nang x hoi. hieu va tham thuc va danh ((khien cua) OR (trien cua)) te*.