Perhaps you should try some spelling variations:
phap thuc » phap thu, phap hoc, phap tu
tu sach » thu sach, te sach, tu cach
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
ve phap » va phap, de phap, ve phan
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
su sach » so sach, vu sach
hu cua » tu cua
vu cua » tu cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (su sach)) ty nang xa hoi. hieu ve phap thuc va hanh ((hu cua) OR (vu cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ty nang xa hoi. hieu ve phap thuc va hanh ((hu cua) OR (vu cua)) te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ty nang xa hoi. hieu ve phap thuc va hanh ((hu cua) OR (vu cua)) te*".