Perhaps you should try some spelling variations:
manh thanh » danh thanh, manh thang, anh thanh
minh thanh » dinh thanh, tinh thanh, hinh thanh
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
nam duc » nam duoc, pham duc, nam thuc
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang
cua su » qua su

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