Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
van hanh » van thanh, ban hanh, van anh
lang mai » lang hai, lang man, sang mai
lang dai » lang hai, lang chai, hoang dai
tu cach » tu cac
hai cua » thai cua, dai cua, hoi cua
tuc van » thuc van, truc van, tuc va
bao tuc » bao thuc, dao tuc, bao luc
hieu va » lieu va, hieu qua
so sach » so sanh, bo sach, co sach
va bao » va bai
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: ((tu cach) or (so sach)) ky ((lang mai) OR (lang dai)) hoi. hieu va bao tuc van hanh hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (so sach)) ky ((lang mai) OR (lang dai)) hoi. hieu va bao tuc van hanh hai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (so sach)) ky ((lang mai) OR (lang dai)) hoi. hieu va bao tuc van hanh hai cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (so sach)) ky ((lang mai) OR (lang dai)) hoi. hieu va bao tuc van hanh hai cua te*.