Perhaps you should try some spelling variations:
ve triet » va trien
su triet » su viet, su tien
cam truc » cau truc, nam truc, lam truoc
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
qua cam » qua cham, qua cac, qua ca
sach ky » sac ky, sach y, sach kem
truc va » thuc va, thuc vat, trung va
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di

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 ty)) nang xa hoi. hieu qua cam truc va danh vi ((su triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach ty)) nang xa hoi. hieu qua cam truc va danh vi ((su triet) OR (ve triet)).
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach ty)) nang xa hoi. hieu qua cam truc va danh vi ((su triet) or (ve triet))*.