Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
thuc dan » thuc hanh, hoc dan, thuc vat
hanh doi » thanh doi, hanh noi, hang doi
xang xa » lang xa, mang xa, ang xa
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc day
doi cua » dai cua, hoi cua
y xang » ty xang
tuc va » truc va, tuc xa, duc va
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 xang xa hoi. hieu va phat ((tuc va) or (((thuc va) OR (thuc dan)))) hanh doi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach y xang xa hoi. hieu va phat ((tuc va) OR (((thuc va) OR (thuc dan)))) hanh doi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach y xang xa hoi. hieu va phat ((tuc va) or (((thuc va) OR (thuc dan)))) hanh doi cua te".
• Adding a wildcard symbol may retrieve word variants: hoc sach y xang xa hoi. hieu va phat ((tuc va) or (((thuc va) OR (thuc dan)))) hanh doi cua te*.