Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
van hanh » van thanh, ban hanh, van anh
hanh ve » hanh vi, hanh va, hanh kem
xuc van » duc van, luc van, xuc ban
cac xuc » cam xuc, cac nuoc, chat xuc
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
lang ha » long ha
cua tu » cua tuc, cua su, cua cu
ve cac » va cac, vien cac

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 ((lang ha) or (nang x)) hoi. hieu ve cac xuc van hanh ve ((cua tu) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((lang ha) OR (nang x)) hoi. hieu ve cac xuc van hanh ve ((cua tu) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((lang ha) or (nang x)) hoi. hieu ve cac xuc van hanh ve ((cua tu) or (cau tren))*.