Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
tang mai » tang ma, tang tai, lang mai
hang hai » hoang hai, hang tai, thanh hai
va hang » van hang, va nang, va lang
cam tuc » cam tu, nam thuc, dam thuc
su sach » so sach
mai hoi » mai khoi, dai hoi, lai hoi
ky tang » ky nang, ky dang, kho tang
vu sach » vu bach, vu khach
hieu va » lieu va, hieu qua
hai va » hai van, thai va, hoi va

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) OR (vu sach)) ky tang mai hoi. hieu va ((cam tuc) or (cam xuc)) va hang hai va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky tang mai hoi. hieu va ((cam tuc) OR (cam xuc)) va hang hai va trien*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ky tang mai hoi. hieu va ((cam tuc) or (cam xuc)) va hang hai va trien*".