Perhaps you should try some spelling variations:
thieu hang » thieu khang, thieu quang, thi hang
phan thuc » nhan thuc, phap thuc, pham thuc
su triet » su viet, su tien, ve triet
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
va trien » va truyen, va thiet, va tuyen
van phan » van phong, van thanh, luan phan
hieu van » hieu va, thien van, lieu va
so sach » so sanh, bo sach, co sach
x hoi » xa hoi, o hoi, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach thieu hang ((x hoi) or (x ho)). hieu van phan thuc van hanh vai ((su triet) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thieu hang ((x hoi) OR (x ho)). hieu van phan thuc van hanh vai ((su triet) OR (va trien)).
• Adding a wildcard symbol may retrieve word variants: so sach thieu hang ((x hoi) or (x ho)). hieu van phan thuc van hanh vai ((su triet) or (va trien))*.