Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
cau tren » cu tren, dau tren, ca tren
va thanh » gia thanh, ban thanh, va tinh
duy nang » dun nang, duy nong, duy sang
sach duy » sach dung, sach duoc, sach dao
cuu tre » cua tre, cau treo
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
cao hoi » cau hoi, co hoi, cao hoc

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 duy nang cao hoi. hieu va ((pham duy) OR (pham duc)) va thanh dat ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach duy nang cao hoi. hieu va ((pham duy) OR (pham duc)) va thanh dat ((cuu tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach duy nang cao hoi. hieu va ((pham duy) OR (pham duc)) va thanh dat ((cuu tre) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: tu sach duy nang cao hoi. hieu va ((pham duy) OR (pham duc)) va thanh dat ((cuu tre) or (cau tren))*.