Perhaps you should try some spelling variations:
trinh nhat » trinh chat, trinh nha, trinh nhap
lam thuoc » nam thuoc, cay thuoc, nam thuc
tinh nhat » tinh chat, minh nhat, tieng nhat
cua viet » ca viet, hoa viet, cua vat
te sach » toc sach
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » lieu va, hieu qua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach _ van xay hoi. hieu va ((lam thuoc) or (am thuc)) va ((tinh nhat) OR (trinh nhat)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach _ van xay hoi. hieu va ((lam thuoc) OR (am thuc)) va ((tinh nhat) OR (trinh nhat)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach _ van xay hoi. hieu va ((lam thuoc) or (am thuc)) va ((tinh nhat) OR (trinh nhat)) cua viet".
• Adding a wildcard symbol may retrieve word variants: te sach _ van xay hoi. hieu va ((lam thuoc) or (am thuc)) va ((tinh nhat) OR (trinh nhat)) cua viet*.