Perhaps you should try some spelling variations:
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
cau treo » cau theo, cau tren, cau triet
hieu va » lieu va, hieu qua
cao duc » dao duc, giao duc, tao duoc
cao suc » cao su
lai cau » lai chau, lai cam, loi cau
nang o » nang co, nang ho, nang ro
sac ky » cac ky
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat ((sai ky) or (sac ky)) nang o hoi. hieu va ((cao duc) OR (cao suc)) van hanh lai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sai ky) OR (sac ky)) nang o hoi. hieu va ((cao duc) OR (cao suc)) van hanh lai cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((sai ky) or (sac ky)) nang o hoi. hieu va ((cao duc) OR (cao suc)) van hanh lai cau treo".
• Adding a wildcard symbol may retrieve word variants: thuat ((sai ky) or (sac ky)) nang o hoi. hieu va ((cao duc) OR (cao suc)) van hanh lai cau treo*.