Perhaps you should try some spelling variations:
cham truc » cau truc, nham thuc, pham thuc
vinh cuu » dinh cuu, sinh cua, tinh cua
te sach » toc sach
dinh cu » dinh cuu, dinh chuc, dinh chau
va danh » va dinh, va dan, va hanh
truc va » thuc va, thuc vat, trung va
va cham » va chat, va tham
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
nang co » nang doc, nang noi, nang hoc

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 co) OR (nang cao)) loi. hieu va cham truc va danh ((vinh cuu) or (dinh cu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((nang co) OR (nang cao)) loi. hieu va cham truc va danh ((vinh cuu) OR (dinh cu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((nang co) OR (nang cao)) loi. hieu va cham truc va danh ((vinh cuu) or (dinh cu)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((nang co) OR (nang cao)) loi. hieu va cham truc va danh ((vinh cuu) or (dinh cu)) tre*.