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
cam duc » cam xuc, cao duc, pham duc
va hang » van hang, va lang, va hanh
hieu ve » hieu va, hieu van
va nang » van nang, da nang, cam nang
ve cam » ve cham, ve cac, va cam
cua tu » cua tuc, cua su, cua te
cua cu » cua chu, cua cau, cua su

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