Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
va thieu » va hieu, va tieu, van hieu
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
han tai » hang tai, nhan tai, van tai
xac va » tac va, ac va, bac va
tuc va » thuc va, truc va, tuc xa
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: tu sach ky nang x hoi. hieu van cham ((xac va) or (tuc va)) han tai ((va thieu) OR (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu van cham ((xac va) OR (tuc va)) han tai ((va thieu) OR (va thiet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. hieu van cham ((xac va) or (tuc va)) han tai ((va thieu) OR (va thiet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu van cham ((xac va) or (tuc va)) han tai ((va thieu) OR (va thiet))*.