Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
su triet » su viet, su tien, ve triet
hanh de » hanh ve, hanh kem
hang di » hang doi, hang vi, hang dien
va cham » va chat, va tham
va cam » va cac, va cao, va cai
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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