Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cau tren » cu tren, dau tren, ca tren
dau tien » van tien
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
va cham » va chat, va tham
cham oc » cham soc, cham o, cham hoi
hanh va » hang va, hanh vi
sach o » sach lo, sac o, sach y
o lang » hoa lang, hoi lang
oc van » hoc van, luoc van, quoc van

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 o lang xa hoi. lieu va cham oc van hanh va ((cau tren) or (dau tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach o lang xa hoi. lieu va cham oc van hanh va ((cau tren) OR (dau tien)).
• Adding a wildcard symbol may retrieve word variants: tu sach o lang xa hoi. lieu va cham oc van hanh va ((cau tren) or (dau tien))*.