Perhaps you should try some spelling variations:
phap thuc » phap thu, phap hoc, phap tu
pham thuc » pham chuc, nham thuc, pham thu
danh vai » danh sai, doanh van, dang van
toc sach » hoc sach, doc sach, thuoc sach
va trien » va truyen, va thiet, va tuyen
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
danh va » doanh va, hanh va, anh va

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