Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
hanh lai » hanh lam, hanh tai, thanh lap
vu sach » vu bach, su sach
lang xa » lang ha, dang xay, lang van
thi van » thi lan, thi hanh, thi nang
cac duc » cac du, cao duc, cac dac
va hanh » van hanh, va thanh, va danh
lai cua » dai cua, hai cua, lai chau
y lang » o lang, _ lang, tay lang
cua te » cua tu

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) or (vu khach)) y lang xa hoi. ((thien van) OR (thi van)) cac duc va hanh lai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) y lang xa hoi. ((thien van) OR (thi van)) cac duc va hanh lai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (vu khach)) y lang xa hoi. ((thien van) OR (thi van)) cac duc va hanh lai cua te".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (vu khach)) y lang xa hoi. ((thien van) OR (thi van)) cac duc va hanh lai cua te*.