Perhaps you should try some spelling variations:
ban thuoc » dang thuoc, cay thuoc, nam thuoc
hieu van » hieu va, thien van, lieu va
thuoc va » thuc va, thuoc ma, thuong va
dua tren » dung tren
cau treo » cau theo, cau tren, cau triet
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va

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 xa hoi. hieu van ban thuoc va dan vi ((dua tren) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. hieu van ban thuoc va dan vi ((dua tren) OR (cau treo)).
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. hieu van ban thuoc va dan vi ((dua tren) or (cau treo))*.