Perhaps you should try some spelling variations:
thanh phan » thanh pho, thanh san, thanh toan
cua triet » cua viet, su triet, va triet
va thanh » gia thanh, ban thanh, va tinh
pham duy » pham duc
cua tre » cua te, cuu tre, dua tren
te sach » toc sach
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
va pham » van pham, va phat, va phap
sach v » sach va, sach y, sach 2
duy va » duy vat, duy van, day va
v nang » va nang, vu nang, van nang

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 v nang ((xa hoi) or (mai hoi)). hieu va pham duy va thanh phan ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach v nang ((xa hoi) OR (mai hoi)). hieu va pham duy va thanh phan ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach v nang ((xa hoi) or (mai hoi)). hieu va pham duy va thanh phan ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: te sach v nang ((xa hoi) or (mai hoi)). hieu va pham duy va thanh phan ((cua tre) OR (cua triet))*.