Perhaps you should try some spelling variations:
thuc day » thuc dan, thuc vat
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
hieu ve » hieu va, hieu van
dan cua » dan ca, ban cua, dai cua
cua cau » cua cac, cua chu, cua cay
ve cam » ve cham, ve cac, va cam
tuc va » thuc va, truc va, tuc xa

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 cao hoi. hieu ve cam ((tuc va) or (thuc day)) dan cua cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang cao hoi. hieu ve cam ((tuc va) OR (thuc day)) dan cua cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang cao hoi. hieu ve cam ((tuc va) or (thuc day)) dan cua cau tren*.