Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu vu » hieu va, hieu ve, dieu vu
hieu su » hieu sau, tieu su, hieu so
thuc va » thuc vat, thuc dan, thuc day
su tien » su kien, su hien, tu tieng
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
va dau » va dao
dau ve » dap ve
ve su » va 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 sac ky dang xa hoi. ((hieu vu) or (hieu su)) pham thuc va dau ve su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky dang xa hoi. ((hieu vu) OR (hieu su)) pham thuc va dau ve su tien.
• Adding a wildcard symbol may retrieve word variants: te sac ky dang xa hoi. ((hieu vu) or (hieu su)) pham thuc va dau ve su tien*.