Perhaps you should try some spelling variations:
phap thuc » phap thu, phap hoc, phap tu
cham truc » cau truc, nham thuc, pham thuc
sach thu » sach thue, sach thieu, sach tham
thanh va » thanh van, hanh va, thanh ha
va thanh » gia thanh, ban thanh, va tinh
lang van » dang van, tang van, hoang van
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay
va cua » va chua, via cua, ca cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach thu ((lang xa) OR (lang van)) hoi. hieu ve ((cham truc) or (phap thuc)) va thanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thu ((lang xa) OR (lang van)) hoi. hieu ve ((cham truc) OR (phap thuc)) va thanh va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach thu ((lang xa) OR (lang van)) hoi. hieu ve ((cham truc) or (phap thuc)) va thanh va cua te".
• Adding a wildcard symbol may retrieve word variants: so sach thu ((lang xa) OR (lang van)) hoi. hieu ve ((cham truc) or (phap thuc)) va thanh va cua te*.