Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
thu sach » tu sach, thuat sach, thuoc sach
hanh lai » hanh lam, hanh tai, thanh lap
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
ve chao » ve chat, ve cham, ve cho
lai cua » dai cua, hai cua, lai chau
xu van » tu van, vu van, su van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (su sach)) ty nang x ho. hieu ve chao xu van hanh lai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (su sach)) ty nang x ho. hieu ve chao xu van hanh lai cua viet.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (su sach)) ty nang x ho. hieu ve chao xu van hanh lai cua viet*.