Perhaps you should try some spelling variations:
sach kha » sach nha, sach ha, sach tham
kha nang » phap nang, ky nang, ki nang
hieu van » thien van, lieu va, hieu ve
hanh tai » thanh tai, hang tai, han tai
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cua tu » cua tuc, cua su, cua cu
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: so sach kha nang x hoi. ((hieu van) OR (hieu va)) pham duc va hanh tai ((cua te) OR (cua tu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach kha nang x hoi. ((hieu van) OR (hieu va)) pham duc va hanh tai ((cua te) OR (cua tu))".
• Adding a wildcard symbol may retrieve word variants: so sach kha nang x hoi. ((hieu van) OR (hieu va)) pham duc va hanh tai ((cua te) OR (cua tu))*.