Perhaps you should try some spelling variations:
nang cau » nang cao, hang cau, nang dau
cam truc » cau truc, nam truc, lam truoc
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
sach ky » sach ty, sach kem, sach hay
va cam » va cham, va cac, va cao
sac ky » cac ky, sai ky
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((((sach ky) or (sac ky))) or (sach y)) nang cau hoi. hieu va cam truc va hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((((sach ky) OR (sac ky))) OR (sach y)) nang cau hoi. hieu va cam truc va hanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((((sach ky) or (sac ky))) or (sach y)) nang cau hoi. hieu va cam truc va hanh va cua tre*.