Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
hoc thien » hoc hien, hoc thieu, hoc thiet
trang vai » trang va, trang tai, trang giai
dung cong » dung trong
tang vat » tang van, dang vat, bang vat
cong van » cong vang, cong san, song van
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thien thanh - hanh ((tang vat) or (trang vai)) dung cong van ((than cau) or (phan tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien thanh - hanh ((tang vat) OR (trang vai)) dung cong van ((than cau) OR (phan tu)).
• Adding a wildcard symbol may retrieve word variants: hoc thien thanh - hanh ((tang vat) or (trang vai)) dung cong van ((than cau) or (phan tu))*.