Perhaps you should try some spelling variations:
trinh van » trinh han, trinh quan, trinh toan
hieu van » hieu va, thien van, lieu va
va trinh » van trinh, va tinh, lap trinh
cau tren » dau tren, ca tren, cau treo
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
nam vua » nam va, nam cua, nam mua
cu tren » tu tren, dua tren
la tren » loai tren, dua tren, dat tren

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang xa hoi. hieu van nam vua va trinh van ((((cau tren) OR (cu tren))) OR (la tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang xa hoi. hieu van nam vua va trinh van ((((cau tren) OR (cu tren))) or (la tren))~".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang xa hoi. hieu van nam vua va trinh van ((((cau tren) OR (cu tren))) or (la tren))*.