Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
hoc sach » hoc sinh, hoc cac, hoc anh
va trien » va truyen, va tieng
danh vai » danh sai, danh va, doanh van
va tuyen » va truyen, tac tuyen, ke tuyen
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va dan, va hanh
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
thuc va » thuc vat, thuc dan, thuc day

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ky lang xa hoi. hieu ve pham thuc va danh vai ((((va trien) OR (va thiet))) or (va tuyen))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky lang xa hoi. hieu ve pham thuc va danh vai ((((va trien) OR (va thiet))) OR (va tuyen)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky lang xa hoi. hieu ve pham thuc va danh vai ((((va trien) OR (va thiet))) or (va tuyen))".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky lang xa hoi. hieu ve pham thuc va danh vai ((((va trien) OR (va thiet))) or (va tuyen))*.