Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
van lam » van nam
lam tuc » lam thuoc, lam truoc, luat tuc
y nang » ly nang, v nang, may nang
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, tuc xa
ve cua » de cua, te cua, ve cum
le cua » ly cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((y nang) OR (ky nang)) ma hoi. hieu van lam tuc va thanh ((ve cua) or (le cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((y nang) OR (ky nang)) ma hoi. hieu van lam tuc va thanh ((ve cua) OR (le cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((y nang) OR (ky nang)) ma hoi. hieu van lam tuc va thanh ((ve cua) or (le cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ((y nang) OR (ky nang)) ma hoi. hieu van lam tuc va thanh ((ve cua) or (le cua)) tre*.