Perhaps you should try some spelling variations:
phap thuc » phap thu, phap hoc, phap tu
tang van » dang van, hoang van, trong van
dan quan » van quan, ban quan, dan luan
thuc dan » thuc hanh, hoc dan, thuc vat
lang van » dang van, hoang van, giang van
hieu ve » hieu va, hieu van
ve phap » va phap, de phap, ve phan
quan vi » quan li, quan tri, quan doi
cua tre » cua te, cuu tre, cua triet
sach o » sach lo, sac o, mach o
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach o) or (sach y)) ((lang van) OR (tang van)) hoi. hieu ve phap thuc dan quan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach o) OR (sach y)) ((lang van) OR (tang van)) hoi. hieu ve phap thuc dan quan vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach o) or (sach y)) ((lang van) OR (tang van)) hoi. hieu ve phap thuc dan quan vi cua tre".
• Adding a wildcard symbol may retrieve word variants: toc ((sach o) or (sach y)) ((lang van) OR (tang van)) hoi. hieu ve phap thuc dan quan vi cua tre*.