Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa
duc manh » suc manh, duc anh, duc minh
cau tren » dau tren, ca tren, cau treo
thu sach » tu sach, thuat sach, thuoc sach
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
cu tren » tu tren, dua tren
ve cam » ve cham, ve cac, va cam
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y nang x hoi. hieu ve cam duc manh ((thanh hai) OR (thanh san)) ((cau tren) or (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang x hoi. hieu ve cam duc manh ((thanh hai) OR (thanh san)) ((cau tren) OR (cu tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang x hoi. hieu ve cam duc manh ((thanh hai) OR (thanh san)) ((cau tren) or (cu tren))".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang x hoi. hieu ve cam duc manh ((thanh hai) OR (thanh san)) ((cau tren) or (cu tren))*.