Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
qua cam » qua cham, qua cac, qua ca
vi va » vi van, vai va, bi va
vu va » vu van, tu va, su va

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky lang xa hoi. hieu qua cam ((thuc dan) or (duc va)) hanh ((vi va) OR (vu va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky lang xa hoi. hieu qua cam ((thuc dan) OR (duc va)) hanh ((vi va) OR (vu va)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky lang xa hoi. hieu qua cam ((thuc dan) or (duc va)) hanh ((vi va) OR (vu va)) triet*".