Perhaps you should try some spelling variations:
thi hang » thi hanh, thi hong, thi thanh
hanh cac » hang cac, hanh cat, nhanh cay
thi nang » thi cong, ki nang, thi hanh
tu sach » thu sach, su sach, te sach
cac cua » cach cua, cac qua, ca cua
va hanh » van hanh, va thanh, va danh
ve chat » va chat, van chat
ve cham » va cham, vu cham, ve chim
cua tre » cua te, cuu tre, cua triet
ca hoi » cau hoi, cua hoi, xa hoi
loc va » hoc va, luc 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 ((thi hang) OR (thi nang)) ca hoi. hieu ((ve cham) or (ve chat)) loc va hanh cac cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((thi hang) OR (thi nang)) ca hoi. hieu ((ve cham) OR (ve chat)) loc va hanh cac cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((thi hang) OR (thi nang)) ca hoi. hieu ((ve cham) or (ve chat)) loc va hanh cac cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((thi hang) OR (thi nang)) ca hoi. hieu ((ve cham) or (ve chat)) loc va hanh cac cua tre*.