Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » hieu va, thien van, lieu va
hang di » hang doi, hang vi, hang dien
hanh de » hanh ve, hanh kem
lam duc » lam duoc, pham duc, nam duoc
van lam » van nam
su viet » so viet
ro hoi » co hoi, o hoi, mo hoi
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang

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