Perhaps you should try some spelling variations:
may nang » may nong, ky nang, cam nang
hang hai » hoang hai, hang tai, thanh hai
te sach » toc sach
hieu va » lieu va, hieu qua
hai cua » thai cua, dai cua, hoi cua
va hang » van hang, va nang, va lang
cao hoi » co hoi, cao hoc, tao hoi
cam duc » cam xuc, cao duc, pham duc
cua tu » cua tuc, cua su, cua cu
va cam » va cham, va cac, va cao
v nang » va nang, vu nang, van nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((may nang) or (v nang)) ((cao hoi) OR (cau hoi)). hieu va cam duc va hang hai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((may nang) OR (v nang)) ((cao hoi) OR (cau hoi)). hieu va cam duc va hang hai cua tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((may nang) or (v nang)) ((cao hoi) OR (cau hoi)). hieu va cam duc va hang hai cua tu*".