Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
doi cua » dai cua, hoi cua
sach ty » sach y, sach tu, sach thu
cao hoi » cau hoi, co hoi, cao hoc
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach kem
cac xuc » cam xuc, cac nuoc, chat xuc
xuc van » duc van, luc van, vuc van
di cua » dai cua, de cua, do cua
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: te ((sach ky) OR (sach ty)) nang cao hoi. hieu ve cac xuc van hanh ((di cua) or (doi cua)) cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach ty)) nang cao hoi. hieu ve cac xuc van hanh ((di cua) OR (doi cua)) cu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sach ty)) nang cao hoi. hieu ve cac xuc van hanh ((di cua) or (doi cua)) cu".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) OR (sach ty)) nang cao hoi. hieu ve cac xuc van hanh ((di cua) or (doi cua)) cu*.