Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » hieu va, thien van, lieu va
ve triet » va trien, su triet
nang ra » nang ma, lang ra, nang va
nang ro » nang co, nang ho, nang rong
sach ky » sac ky, sach y, sach ty
lam duc » lam duoc, pham duc, nam duoc
hanh de » hanh ve, hanh kem
hang di » hang doi, hang vi, hang dien
van lam » van nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ky ((nang ro) OR (nang ra)) hoi. hieu van lam duc va ((hanh de) or (hang di)) ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky ((nang ro) OR (nang ra)) hoi. hieu van lam duc va ((hanh de) OR (hang di)) ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky ((nang ro) OR (nang ra)) hoi. hieu van lam duc va ((hanh de) or (hang di)) ve triet".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky ((nang ro) OR (nang ra)) hoi. hieu van lam duc va ((hanh de) or (hang di)) ve triet*.