Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
doc sach » hoc sach, toc sach, nuoc sach
danh vai » danh sai, danh va, doanh van
va trien » va truyen, va thiet, va tuyen
va thieu » va thiet, va hieu, va tieu
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach ky lang xa hoi. hieu ve pham thuc va danh vai ((va trien) or (va thieu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ky lang xa hoi. hieu ve pham thuc va danh vai ((va trien) OR (va thieu)).
• Adding a wildcard symbol may retrieve word variants: doc sach ky lang xa hoi. hieu ve pham thuc va danh vai ((va trien) or (va thieu))*.