Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
sach ky » sach y, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
hai cua » thai cua, dai cua, hoi cua
sac ky » cac ky, sai ky
ve cao » va cao, ve bao, ve cac
loc va » hoc va, luc va
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat ((sach ky) or (sac ky)) nang xa hoi. hieu ve cao ((loc va) or (duc va)) hanh hai cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach ky) OR (sac ky)) nang xa hoi. hieu ve cao ((loc va) OR (duc va)) hanh hai cua su.
• Adding a wildcard symbol may retrieve word variants: thuat ((sach ky) or (sac ky)) nang xa hoi. hieu ve cao ((loc va) or (duc va)) hanh hai cua su*.