Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh lai » hanh lam, hanh tai, thanh lap
thuc van » thuc vat, thuc dan, thuc va
cua viet » ca viet, hoa viet, cua vat
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
vuc van » duc van, luc van, chuc van
su sach » so sach, vu sach
lai cua » dai cua, hai cua, lai chau
ve chat » va chat, van chat

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 chat ((vuc van) OR (thuc 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 chat ((vuc van) OR (thuc van)) hanh lai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (su sach)) ty nang x ho. hieu ve chat ((vuc van) OR (thuc van)) hanh lai cua viet".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (su sach)) ty nang x ho. hieu ve chat ((vuc van) OR (thuc van)) hanh lai cua viet*.