Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
dang hai » dang khai, hang hai, dung hai
van dang » van dong, van dung, van nang
nuoc van » nuoc va, nuoc san, luoc van
van hac » van hoc, van ha, van hai
hai cua » thai cua, dai cua, hoi cua
van cac » van cau, van bac, dan cac
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
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: thuat sach ky ((nang xa) or (nang ma)) hoi. hieu ((van cac) OR (van hac)) nuoc van dang hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky ((nang xa) OR (nang ma)) hoi. hieu ((van cac) OR (van hac)) nuoc van dang hai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky ((nang xa) or (nang ma)) hoi. hieu ((van cac) OR (van hac)) nuoc van dang hai cua te".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky ((nang xa) or (nang ma)) hoi. hieu ((van cac) OR (van hac)) nuoc van dang hai cua te*.