Perhaps you should try some spelling variations:
trinh dieu » trinh dien, tinh dieu, trinh dinh
lam thuoc » nam thuoc, am thuc, cay thuoc
hieu van » hieu va, thien van, lieu va
luat tuc » luat thue
so sach » so sanh, bo sach, co sach
nang ho » nang hoc, nang co, tang ho
y nang » ky nang, ly nang, v nang
ho hai » hoc hai, pho hai, cho hai
tra te » tra tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y nang ho hai. hieu van ((lam thuoc) or (luat tuc)) va ((trinh dieu) or (tinh dien)) tra te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang ho hai. hieu van ((lam thuoc) OR (luat tuc)) va ((trinh dieu) OR (tinh dien)) tra te.
• Adding a wildcard symbol may retrieve word variants: so sach y nang ho hai. hieu van ((lam thuoc) or (luat tuc)) va ((trinh dieu) or (tinh dien)) tra te*.