Perhaps you should try some spelling variations:
may trinh » may tinh, lap trinh, quy trinh
hieu vien » hieu hien, hieu viec, thieu nien
trinh vat » trinh van, trinh luat, sinh vat
dai nuoc » dat nuoc, dai luoc, dang nuoc
dau nuoc » dat nuoc, dau ngoc, cap nuoc
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
vat va » dat va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach tu nang x ho. hieu vien ((dai nuoc) or (dau nuoc)) may trinh vat va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu nang x ho. hieu vien ((dai nuoc) OR (dau nuoc)) may trinh vat va triet.
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang x ho. hieu vien ((dai nuoc) or (dau nuoc)) may trinh vat va triet*.