Perhaps you should try some spelling variations:
thien van » thi van
nang cau » nang cao, hang cau, nang dau
van cham » van chat, van tham, va cham
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
truc va » thuc va, thuc vat, trung va
lai cua » hai cua, lai chau, thai cua
tuc va » thuc va, tuc xa, duc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang cau hoi. thien van cham ((tuc va) or (truc va)) hanh ((lai cua) OR (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang cau hoi. thien van cham ((tuc va) OR (truc va)) hanh ((lai cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang cau hoi. thien van cham ((tuc va) or (truc va)) hanh ((lai cua) OR (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang cau hoi. thien van cham ((tuc va) or (truc va)) hanh ((lai cua) OR (dai cua)) tre*.