Perhaps you should try some spelling variations:
hanh mai » hanh ma, hanh mau, hanh may
va trien » va truyen, va tuyen, va tieng
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
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: te sach ty nang xa hoi. ((hieu ve) OR (hieu qua)) cau truc va hanh mai ((va trien) OR (va thiet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang xa hoi. ((hieu ve) or (hieu qua)) cau truc va hanh mai ((va trien) OR (va thiet))~".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang xa hoi. ((hieu ve) or (hieu qua)) cau truc va hanh mai ((va trien) OR (va thiet))*.