Perhaps you should try some spelling variations:
thanh hoa » thanh pho
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
cam truc » nam truc, lam truoc, nam truoc
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
cu tren » tu tren, dua tren
hoa cu » hoa cua, hoa cau, hoa co

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y ((nang xa) or (nang ma)) hoi. thien van ((cam truc) OR (cau truc)) va thanh hoa cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((nang xa) OR (nang ma)) hoi. thien van ((cam truc) OR (cau truc)) va thanh hoa cu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y ((nang xa) or (nang ma)) hoi. thien van ((cam truc) OR (cau truc)) va thanh hoa cu tren".
• Adding a wildcard symbol may retrieve word variants: thu sach y ((nang xa) or (nang ma)) hoi. thien van ((cam truc) OR (cau truc)) va thanh hoa cu tren*.