Perhaps you should try some spelling variations:
can thanh » ban thanh, van thanh, cac thanh
kham duy » pham duy, khanh duy, pham duc
sach ky » sac ky, sach y, sach ty
duy can » duy van
tu sach » thu sach, su sach, te sach
hieu vu » hieu va, hieu ve, dieu vu
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
hieu su » hieu sau, tieu su, hieu so
ha hoi » hoa hoi, ha noi, xa hoi
va va » va van, va vai, va vat

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 lang ha hoi. ((hieu vu) OR (hieu su)) kham duy can thanh ((va va) or (va vua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang ha hoi. ((hieu vu) OR (hieu su)) kham duy can thanh ((va va) OR (va vua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky lang ha hoi. ((hieu vu) OR (hieu su)) kham duy can thanh ((va va) or (va vua)) triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang ha hoi. ((hieu vu) OR (hieu su)) kham duy can thanh ((va va) or (va vua)) triet*.