Perhaps you should try some spelling variations:
manh thanh » danh thanh, minh thanh, manh thang
thanh lap » thanh san, phan lap, thanh hai
dang xay » dang van
duc manh » suc manh, duc anh, duc minh
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
va pham » van pham, va phat, va phap
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu

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 ty ((dang xay) OR (van xay)) hoi. lieu va pham duc manh thanh lap ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((dang xay) OR (van xay)) hoi. lieu va pham duc manh thanh lap ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((dang xay) OR (van xay)) hoi. lieu va pham duc manh thanh lap ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((dang xay) OR (van xay)) hoi. lieu va pham duc manh thanh lap ((cua tre) or (cua te))*.