Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
thuc dang » thuoc dang, thuc dan, thuc dung
dang tinh » dang dinh, dang sinh, dang vinh
su triet » su viet, su tien
ve triet » va trien
hieu van » thien van, lieu va, hieu ve
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
tinh vi » trinh vi, tinh voi, tinh va
ky lang » ky nang, ky dang, ky tang
te sach » toc sach

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 lang xa hoi. ((hieu van) OR (hieu va)) nham thuc dang tinh vi ((su triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang xa hoi. ((hieu van) OR (hieu va)) nham thuc dang tinh vi ((su triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang xa hoi. ((hieu van) OR (hieu va)) nham thuc dang tinh vi ((su triet) or (ve triet))".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang xa hoi. ((hieu van) OR (hieu va)) nham thuc dang tinh vi ((su triet) or (ve triet))*.