Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
lang van » dang van, tang van, hoang van
hieu ve » hieu va, hieu van
hanh tu » anh tu, danh tu
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
ve pham » vi pham, v pham, ve phan
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay
nang xa » nang x, nang ma, mang xa
tu cua » hu cua, vu 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: tu sach ty ((nang xa) or (((lang xa) OR (lang van)))) hoi. hieu ve pham thuc va hanh tu cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang xa) OR (((lang xa) OR (lang van)))) hoi. hieu ve pham thuc va hanh tu cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang xa) or (((lang xa) OR (lang van)))) hoi. hieu ve pham thuc va hanh tu cua te*".