Perhaps you should try some spelling variations:
chay tren » thai tren, ca tren, cau tren
thanh lap » thanh san, phan lap, thanh hai
thanh lam » hanh lam, thanh nam, thanh tam
hieu van » hieu va, thien van, lieu va
luc van » luoc van, luu van, duc van
cam luc » cam xuc, cau luc
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
van cam » van nam, van lam, van cau
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: tu ((sach ky) or (sach ty)) nang x hoi. hieu van cam luc van ((thanh lam) OR (thanh lap)) chay tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach ty)) nang x hoi. hieu van cam luc van ((thanh lam) OR (thanh lap)) chay tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach ty)) nang x hoi. hieu van cam luc van ((thanh lam) OR (thanh lap)) chay tren".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach ty)) nang x hoi. hieu van cam luc van ((thanh lam) OR (thanh lap)) chay tren*.