Perhaps you should try some spelling variations:
kho tang » cao tang
su sach » so sach, vu sach
cao luc » bao luc, cao duc, cao suc
ky tang » ky nang, ky dang, ky trong
so sanh » do sanh
va cao » va cac, va co, va dao
luc va » duc va, tuc va, loc va
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

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) or (so sanh)) ((ky tang) OR (kho tang)) xa hoi. lieu va cao luc va dan vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sanh)) ((ky tang) OR (kho tang)) xa hoi. lieu va cao luc va dan vi cua tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sanh)) ((ky tang) OR (kho tang)) xa hoi. lieu va cao luc va dan vi cua tu*".