Perhaps you should try some spelling variations:
nang doc » nang luc
van truc » van thuc, van tru, vao truc
ve triet » su triet
va trien » va truyen, va thiet, va tuyen
su sach » so sach, vu sach
doc hai » hoc hai, duc hai, do hai
truc va » thuc va, thuc vat, trung va
hanh va » hanh vi
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang doc hai. lieu va van truc va ((hanh va) OR (hang va)) ((ve triet) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang doc hai. lieu va van truc va ((hanh va) OR (hang va)) ((ve triet) OR (va trien))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang doc hai. lieu va van truc va ((hanh va) OR (hang va)) ((ve triet) or (va trien))*".