Perhaps you should try some spelling variations:
van thiet » va thiet, dan thiet, can thiet
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
qua cam » qua cham, qua cac, qua ca
truc va » trung va
thuc va » thuc dan, thuc day
danh vi » hanh vi, dinh vi, danh di
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: su sach ly nang x hoi. hieu qua cam ((truc va) or (((thuc va) or (thuc vat)))) danh vi van thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang x hoi. hieu qua cam ((truc va) OR (((thuc va) OR (thuc vat)))) danh vi van thiet.
• Adding a wildcard symbol may retrieve word variants: su sach ly nang x hoi. hieu qua cam ((truc va) or (((thuc va) or (thuc vat)))) danh vi van thiet*.