Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
toc sach » hoc sach, doc sach, thuoc sach
danh vai » danh sai, danh va, doanh van
va trien » va truyen, va tuyen, va tieng
sach ty » sach y, sach tu, sach thu
ty lang » tay lang, ty xang, ty hang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
thiet » thieu

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

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