Perhaps you should try some spelling variations:
ban manh » ban hanh, van manh, ban anh
ban mach » ban sach, ranh mach, ban hanh
sach ky » sach y, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
hai chu » hai chau, hoi chu, hai chi
chu tre » cho tre, chu tri, cuu tre
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, va cam

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 ky) or (sac ky)) nang xa hoi. hieu ve cam xuc ((ban manh) OR (ban mach)) hai chu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang xa hoi. hieu ve cam xuc ((ban manh) OR (ban mach)) hai chu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sac ky)) nang xa hoi. hieu ve cam xuc ((ban manh) OR (ban mach)) hai chu tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) nang xa hoi. hieu ve cam xuc ((ban manh) OR (ban mach)) hai chu tre*.