Perhaps you should try some spelling variations:
qua cham » qua cac, va cham, qua cua
han thai » han tai, ban thai, van thai
sach ky » sach y, sach ty, sach kem
qua hai » qua hoat
xuc van » duc van, luc van, vuc van
van han » van hanh, van phan, van nhan
thai va » thai van
sac ky » cac ky, sai ky
x hoi » xa hoi, o hoi, x ho
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: su ((sach ky) or (sac ky)) nang x hoi. hieu ((qua cham) OR (qua hai)) xuc van han thai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) nang x hoi. hieu ((qua cham) OR (qua hai)) xuc van han thai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sac ky)) nang x hoi. hieu ((qua cham) OR (qua hai)) xuc van han thai va thiet".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sac ky)) nang x hoi. hieu ((qua cham) OR (qua hai)) xuc van han thai va thiet*.