Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
van tuan » van quan, van ban, anh tuan
thuc van » thuc vat, thuc dan, thuc va
ve pham » vi pham, v pham, ve phan
tuan ve » tuan le, quan ve, luan ve
ve phat » va phat, te phat, de phat
van hoi » van hoa, van hoc, van hoe
k5 tang » ky tang, kho tang, 25 thang
5 tang » 6 tang, 7 tang
ve cua » le cua, de cua, te cua
cua cu » cua chu, cua cau, cua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ((5 tang) OR (k5 tang)) van hoi. hieu ((ve pham) OR (ve phat)) thuc van tuan ve cua cu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((5 tang) OR (k5 tang)) van hoi. hieu ((ve pham) OR (ve phat)) thuc van tuan ve cua cu".
• Adding a wildcard symbol may retrieve word variants: hoc sach ((5 tang) OR (k5 tang)) van hoi. hieu ((ve pham) OR (ve phat)) thuc van tuan ve cua cu*.