Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
vat danh » va danh, van danh, luat danh
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van bac » van ban, van bao, dan bac
van hac » van hoc, van ha, van hai
doi cua » dai cua, hoi cua
di cua » dai cua, de cua, do cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ky nang xa hoi. hieu ((van bac) or (van hac)) thuc vat danh ((di cua) OR (doi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky nang xa hoi. hieu ((van bac) OR (van hac)) thuc vat danh ((di cua) OR (doi cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky nang xa hoi. hieu ((van bac) or (van hac)) thuc vat danh ((di cua) OR (doi cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky nang xa hoi. hieu ((van bac) or (van hac)) thuc vat danh ((di cua) OR (doi cua)) tre*.