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 phat » va phat, te phat, de phat
tuan ve » tuan le, quan ve, luan ve
ve pham » vi pham, v pham, ve phan
van hoi » van hoa, van hoc, van hoe
ky tang » ky nang, ky dang, kho tang
y tang » 6 tang, 7 tang, 5 tang
ve cua » le cua, de cua, te cua
cua te » cua tu

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 ((y tang) OR (ky tang)) van hoi. hieu ((ve pham) or (ve phat)) thuc van tuan ve cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((y tang) OR (ky tang)) van hoi. hieu ((ve pham) OR (ve phat)) thuc van tuan ve cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((y tang) OR (ky tang)) van hoi. hieu ((ve pham) or (ve phat)) thuc van tuan ve cua te".
• Adding a wildcard symbol may retrieve word variants: hoc sach ((y tang) OR (ky tang)) van hoi. hieu ((ve pham) or (ve phat)) thuc van tuan ve cua te*.