Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
han mai » han tai, ban mai, han mac
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
x hoi » xa hoi, o hoi, x ho
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (su sach)) ky nang x hoi. hieu van nam ((xuc va) OR (tuc va)) han mai va thiet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky nang x hoi. hieu van nam ((xuc va) OR (tuc va)) han mai va thiet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ky nang x hoi. hieu van nam ((xuc va) OR (tuc va)) han mai va thiet*.