Perhaps you should try some spelling variations:
va trien » va truyen, va tuyen, va tieng
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
su sach » so sach, vu sach
hanh va » hanh vi
thuc va » thuc vat, thuc dan, thuc day
sach ly » sach y, sach lo, sach ty
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
ma hoi » mai hoi, xa hoi, ma hoa
thiet » thieu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang ma hoi. hieu van nam thuc va ((hanh va) OR (hang va)) ((va trien) OR (va thiet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ly nang ma hoi. hieu van nam thuc va ((hanh va) OR (hang va)) ((va trien) or (va thiet))~".
• Adding a wildcard symbol may retrieve word variants: su sach ly nang ma hoi. hieu van nam thuc va ((hanh va) OR (hang va)) ((va trien) or (va thiet))*.