Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
tang nong » hang nong, tang dong, tang mong
trung ha » trung hoc, trung tam, trung cap
nong dan » cong dan, nong san, nguong dan
toan tai » doanh tai, toan ban, toan cao
toan tap » toan ban
ha tang » phap tang, cao tang, kho tang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu sach - thanh trung ha tang nong dan ((toan tai) or (((toan tap) or (van ban))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - thanh trung ha tang nong dan ((toan tai) OR (((toan tap) OR (van ban)))).
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - thanh trung ha tang nong dan ((toan tai) or (((toan tap) or (van ban))))*.