Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
vanh dai » van dai, vanh tai, lanh dao
sach ty » sach tu, sach thu, xach tay
cuu tre » cua tre, cau treo
va vanh » va van, va danh, va hanh
cac xuc » cam xuc, cac nuoc, chat xuc
hieu va » lieu va, hieu qua
xuc va » duc va, tuc va, luc va
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: te ((sach ty) or (sach y)) nang x hoi. hieu va cac xuc va vanh dai ((cuu tre) OR (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach y)) nang x hoi. hieu va cac xuc va vanh dai ((cuu tre) OR (cau tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) or (sach y)) nang x hoi. hieu va cac xuc va vanh dai ((cuu tre) OR (cau tren))*".