Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
lam duoc » luat duoc, lam thuoc, tao duoc
nam duoc » nam thuoc, da duoc, nam moc
dat duoc » dat nuoc, da duoc, luat duoc
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
sach ky » sac ky, sach y, sach ty
viet ca » viet ha, viet co, viet a
va anh » van anh, va danh, va hanh
ca te » cua te, ca ve, ca me

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky lang xa hoi. hieu van ((lam duoc) or (((nam duoc) or (dat duoc)))) va anh viet ca te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky lang xa hoi. hieu van ((lam duoc) OR (((nam duoc) OR (dat duoc)))) va anh viet ca te.
• Adding a wildcard symbol may retrieve word variants: toc sach ky lang xa hoi. hieu van ((lam duoc) or (((nam duoc) or (dat duoc)))) va anh viet ca te*.