Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
thanh do » thanh de, thanh pho, thanh hoa
va thanh » gia thanh, ban thanh, va tinh
van pham » san pham, van phan, van phat
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, tu cach
nang xa » nang x, lang xa, mang xa
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
do su » do sut, do tu, co 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) or (te sach)) ky ((nang xa) OR (nang ma)) hoi. hieu van pham duc va thanh do su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky ((nang xa) OR (nang ma)) hoi. hieu van pham duc va thanh do su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky ((nang xa) OR (nang ma)) hoi. hieu van pham duc va thanh do su triet*".