Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
gian lai » gianh lai, gian lan, gia lai
nang dai » nang dau, nang tai, lang dai
lai cua » dai cua, hai cua, lai chau
va gian » va gianh, van gian, va giai
cua tre » cua te, cuu tre, cua triet
dai hai » dai han, dai hoi, dai tai
su sach » so sach, vu sach
va cam » va cham, va cac, va cao
loc va » hoc va, luc va
ve cam » ve cham, ve cac, ve cai

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)) ky nang dai hai. hieu ((ve cam) or (va cam)) loc va gian lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (su sach)) ky nang dai hai. hieu ((ve cam) OR (va cam)) loc va gian lai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (su sach)) ky nang dai hai. hieu ((ve cam) or (va cam)) loc va gian lai cua tre*.