Perhaps you should try some spelling variations:
kho tang » cao tang
vanh dai » van dai, vanh tai, lanh dao
su sach » so sach, vu sach
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, ky trong
qua hai » qua hoat
hai luc » hai cuc, khai luoc, nhan luc
va vanh » va van, va danh, va hanh
luc va » duc va, tuc va, loc va
cua te » cua tu

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 lang) or (((ky tang) OR (kho tang)))) xa hoi. hieu qua hai luc va vanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky lang) OR (((ky tang) OR (kho tang)))) xa hoi. hieu qua hai luc va vanh dai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky lang) or (((ky tang) OR (kho tang)))) xa hoi. hieu qua hai luc va vanh dai cua te*".