Perhaps you should try some spelling variations:
sach tham » sach nha
cham duc » pham duc, cham soc, pham duy
vanh dai » vanh tai, lanh dao, van dao
duc tang » duc thang, duc tan, tuc tang
van dai » van dao, van hai, can dai
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
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: tu ((sach ty) OR (sach tham)) nang xa hoi. hieu ve cham duc tang ((vanh dai) OR (van dai)) va thiet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach tham)) nang xa hoi. hieu ve cham duc tang ((vanh dai) OR (van dai)) va thiet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) OR (sach tham)) nang xa hoi. hieu ve cham duc tang ((vanh dai) OR (van dai)) va thiet*.