Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
sach kem » hanh kem
sach ky » sach y, sach ty, sach hay
va hanh » van hanh, va thanh, va danh
hieu te » hieu ve, hien te, hieu he
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
te ban » te bao
ban bo » can bo, ban do, ban co
vi cau » va cau, ve cau, di cau
bo va » bao va, do va, so va

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 (sach kem))) or (sac ky)) nang xa hoi. hieu te ban bo va hanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((((sach ky) OR (sach kem))) OR (sac ky)) nang xa hoi. hieu te ban bo va hanh vi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((((sach ky) OR (sach kem))) or (sac ky)) nang xa hoi. hieu te ban bo va hanh vi cau tren".
• Adding a wildcard symbol may retrieve word variants: su ((((sach ky) OR (sach kem))) or (sac ky)) nang xa hoi. hieu te ban bo va hanh vi cau tren*.