Perhaps you should try some spelling variations:
sach tham » sach nha
nang tai » hang tai, tang tai, nang cao
sang tai » hang tai, sang tao, tang tai
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
qua cam » qua cham, qua cac, qua ca
xuc van » duc van, vuc van, xuc ban
luc van » luoc van, luu van, duc van

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach tham ((nang tai) OR (sang tai)) hoi. hieu qua cam ((xuc van) or (luc van)) hang va su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tham ((nang tai) OR (sang tai)) hoi. hieu qua cam ((xuc van) OR (luc van)) hang va su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tham ((nang tai) OR (sang tai)) hoi. hieu qua cam ((xuc van) or (luc van)) hang va su triet".
• Adding a wildcard symbol may retrieve word variants: su sach tham ((nang tai) OR (sang tai)) hoi. hieu qua cam ((xuc van) or (luc van)) hang va su triet*.