Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
thanh de » hanh de, thanh ve, thanh do
va thanh » gia thanh, ban thanh, va tinh
nam truc » nam truoc, nam thuc, nam trung
lam truc » lam truoc, lam thuoc, lam trung
cau treo » cau theo, cau tren, cau triet
y nang » ly nang, v nang, may nang
de cau » ke cau, le cau, ve cau
o hoi » co hoi, o hoc, o hai

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) OR (ky nang)) o hoi. thien van ((lam truc) or (nam truc)) va thanh de cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((y nang) OR (ky nang)) o hoi. thien van ((lam truc) OR (nam truc)) va thanh de cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((y nang) OR (ky nang)) o hoi. thien van ((lam truc) or (nam truc)) va thanh de cau treo".
• Adding a wildcard symbol may retrieve word variants: thu sach ((y nang) OR (ky nang)) o hoi. thien van ((lam truc) or (nam truc)) va thanh de cau treo*.