Perhaps you should try some spelling variations:
kinh kien » kinh dien, linh kien, dinh kien
kien cau » khien cau, hien cau, thien cau
cau tren » cu tren, dau tren, ca tren
sach ty » sach y, sach thu, xach tay
sach tu » sach thu, cach tu, sach uu
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
va kinh » va tinh, qua kinh
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa
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: te ((sach ty) OR (sach tu)) nang x hoi. hieu va cam tuc va kinh kien cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) OR (sach tu)) nang x hoi. hieu va cam tuc va kinh kien cau tren".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) OR (sach tu)) nang x hoi. hieu va cam tuc va kinh kien cau tren*.