Perhaps you should try some spelling variations:
phap thuc » phap thu, phap hoc, phap tu
ban thanh » ban hanh, ban hang
va thanh » gia thanh, va tinh, le thanh
su sach » so sach, vu sach
va phap » va phat, ban phap
sach ky » sac ky, sach y, sach ty
lang ha » long ha
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
de cua » le cua, te cua, dieu cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky ((nang xa) or (lang ha)) hoi. lieu va phap thuc ((va thanh) OR (ban thanh)) de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (lang ha)) hoi. lieu va phap thuc ((va thanh) OR (ban thanh)) de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang xa) or (lang ha)) hoi. lieu va phap thuc ((va thanh) OR (ban thanh)) de cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) or (lang ha)) hoi. lieu va phap thuc ((va thanh) OR (ban thanh)) de cua tre*.