Perhaps you should try some spelling variations:
tham duc » pham duc, tham du, than duc
van hanh » van thanh, ban hanh, van anh
hanh lai » hanh lam, hanh tai, thanh lap
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
xang ha » lang ha, tang ha, hang ha
dang ha » dong ha, dung ha, lang ha
va tham » van tham, va cham, va thanh
duc van » duc va, duc tan, duc manh
lai cua » dai cua, hai cua, lai chau
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty ((xang ha) or (dang ha)) hoi. lieu va tham duc van hanh lai cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((xang ha) OR (dang ha)) hoi. lieu va tham duc van hanh lai cua su.
• Adding a wildcard symbol may retrieve word variants: su sach ty ((xang ha) or (dang ha)) hoi. lieu va tham duc van hanh lai cua su*.