Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
san hanh » san thanh, ban hanh, van hanh
hanh dai » hanh tai, hanh dao, vanh dai
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
nam qua » nam quan, nam mua, nam xua
cua tre » cua te, cuu tre, cua triet

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 y ((nang xa) or (nang ma)) hoi. thien van ((nam qua) OR (nam cua)) san hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((nang xa) OR (nang ma)) hoi. thien van ((nam qua) OR (nam cua)) san hanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y ((nang xa) or (nang ma)) hoi. thien van ((nam qua) OR (nam cua)) san hanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach y ((nang xa) or (nang ma)) hoi. thien van ((nam qua) OR (nam cua)) san hanh dai cua tre*.