Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu vu » hieu va, hieu ve, hieu su
vu pham » su pham, vi pham, vu kham
thuc va » thuc vat, thuc dan, thuc day
va dau » va dao
vi su » va su, ve su, oi su
ki su » ky su

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky dang xa hoi. hieu vu pham thuc va dau ((vi su) OR (ki su)) tien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dang xa hoi. hieu vu pham thuc va dau ((vi su) OR (ki su)) tien".
• Adding a wildcard symbol may retrieve word variants: te sach ky dang xa hoi. hieu vu pham thuc va dau ((vi su) OR (ki su)) tien*.