Perhaps you should try some spelling variations:
thien cac » thien cau, thieu cac, trien cac
hanh lai » hanh lam, hanh tai, thanh lap
hien cac » vien cac, hieu cac, dien cac
vu sach » vu bach, su sach, vu khach
va hanh » van hanh, va thanh, va danh
nang xa » nang x, lang xa, nang ma
lai cua » dai cua, hai cua, lai chau
sach ky » sac ky, sach y, sach ty
cua te » cua tu
lo va » lo van, lao va, ly va

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky ((nang xa) or (nang cao)) hoi. hieu ((hien cac) OR (thien cac)) lo va hanh lai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky ((nang xa) OR (nang cao)) hoi. hieu ((hien cac) OR (thien cac)) lo va hanh lai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky ((nang xa) or (nang cao)) hoi. hieu ((hien cac) OR (thien cac)) lo va hanh lai cua te".
• Adding a wildcard symbol may retrieve word variants: vu sach ky ((nang xa) or (nang cao)) hoi. hieu ((hien cac) OR (thien cac)) lo va hanh lai cua te*.