Perhaps you should try some spelling variations:
thanh van » thanh toan, thanh phan, thanh nhan
cham duc » pham duc, cham soc, pham duy
va trien » va truyen, va thiet, va tuyen
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
tang ma » mang may, tang van
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
duc gia » quoc gia

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty ((nang x) or (tang ma)) hoi. hieu ve cham duc gia ((thanh van) OR (thanh san)) va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang x) OR (tang ma)) hoi. hieu ve cham duc gia ((thanh van) OR (thanh san)) va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang x) or (tang ma)) hoi. hieu ve cham duc gia ((thanh van) OR (thanh san)) va trien".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang x) or (tang ma)) hoi. hieu ve cham duc gia ((thanh van) OR (thanh san)) va trien*.